木马免杀-字符串特征绕过的一些思路(第一版)

字符串获取的一些思路(第一版)

众所周知,远程加载容易被发现，加解密容易引起注意 那么有没有什么办法呢？

• 1.获取系统函数的返回结果

1-1利用windows CMD的echo 函数打印shellcode,并获取打印结果.

例如(Python3脚本) :

import os
shellcode = os.popen("echo \x64\x87...").read()

1-2利用windows CMD的type函数打印文件中的shellcode

“Python的Open函数读文件不可以吗”，其实我觉得用Python读取文件是任何人都可以想到的.
或许我们可以利用防守者可能想不到的系统命令来辅助我们读取文件

例如(Python3脚本):

import os
shellcode = os.popen("type shellcode.txt").read()

• 1-3 利用系统内置白名单(可以综合1-1，1-2)

例如Windows自带的白名单...

例如:代码弹计算器代码(Python3):

import os
os.system("p^c^a^l^u^a^ ^-^n^ ^-^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^n^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a^^a^a^a^a^a^a^a^a^a^a calc.exe")

• 1-4 混合加密

众所周知,一般的加密(Base64/xor...)容易被识别,那我们混合即可

• 如先 Base64 再XOR，再去除XOR的特征。使用时再加上XOR的特征