mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-12-18 00:41:11 +00:00
87 lines
2.7 KiB
Python
87 lines
2.7 KiB
Python
#
|
|
# deobfuscator for scripts messed up with myobfuscate.com
|
|
# by Einar Lielmanis <einar@jsbeautifier.org>
|
|
#
|
|
# written by Stefano Sanfilippo <a.little.coder@gmail.com>
|
|
#
|
|
# usage:
|
|
#
|
|
# if detect(some_string):
|
|
# unpacked = unpack(some_string)
|
|
#
|
|
|
|
# CAVEAT by Einar Lielmanis
|
|
|
|
#
|
|
# You really don't want to obfuscate your scripts there: they're tracking
|
|
# your unpackings, your script gets turned into something like this,
|
|
# as of 2011-08-26:
|
|
#
|
|
# var _escape = 'your_script_escaped';
|
|
# var _111 = document.createElement('script');
|
|
# _111.src = 'http://api.www.myobfuscate.com/?getsrc=ok' +
|
|
# '&ref=' + encodeURIComponent(document.referrer) +
|
|
# '&url=' + encodeURIComponent(document.URL);
|
|
# var 000 = document.getElementsByTagName('head')[0];
|
|
# 000.appendChild(_111);
|
|
# document.write(unescape(_escape));
|
|
#
|
|
|
|
"""Deobfuscator for scripts messed up with MyObfuscate.com"""
|
|
|
|
import re
|
|
import base64
|
|
|
|
# Python 2 retrocompatibility
|
|
# pylint: disable=F0401
|
|
# pylint: disable=E0611
|
|
try:
|
|
from urllib import unquote
|
|
except ImportError:
|
|
from urllib.parse import unquote
|
|
|
|
from . import UnpackingError
|
|
|
|
PRIORITY = 1
|
|
|
|
CAVEAT = """//
|
|
// Unpacker warning: be careful when using myobfuscate.com for your projects:
|
|
// scripts obfuscated by the free online version call back home.
|
|
//
|
|
|
|
"""
|
|
|
|
SIGNATURE = (r'["\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4A\x4B\x4C\x4D\x4E\x4F'
|
|
r'\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5A\x61\x62\x63\x64\x65'
|
|
r'\x66\x67\x68\x69\x6A\x6B\x6C\x6D\x6E\x6F\x70\x71\x72\x73\x74\x75'
|
|
r'\x76\x77\x78\x79\x7A\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x2B'
|
|
r'\x2F\x3D","","\x63\x68\x61\x72\x41\x74","\x69\x6E\x64\x65\x78'
|
|
r'\x4F\x66","\x66\x72\x6F\x6D\x43\x68\x61\x72\x43\x6F\x64\x65","'
|
|
r'\x6C\x65\x6E\x67\x74\x68"]')
|
|
|
|
def detect(source):
|
|
"""Detects MyObfuscate.com packer."""
|
|
return SIGNATURE in source
|
|
|
|
def unpack(source):
|
|
"""Unpacks js code packed with MyObfuscate.com"""
|
|
if not detect(source):
|
|
return source
|
|
payload = unquote(_filter(source))
|
|
match = re.search(r"^var _escape\='<script>(.*)<\/script>'",
|
|
payload, re.DOTALL)
|
|
polished = match.group(1) if match else source
|
|
return CAVEAT + polished
|
|
|
|
def _filter(source):
|
|
"""Extracts and decode payload (original file) from `source`"""
|
|
try:
|
|
varname = re.search(r'eval\(\w+\(\w+\((\w+)\)\)\);', source).group(1)
|
|
reverse = re.search(r"var +%s *\= *'(.*)';" % varname, source).group(1)
|
|
except AttributeError:
|
|
raise UnpackingError('Malformed MyObfuscate data.')
|
|
try:
|
|
return base64.b64decode(reverse[::-1].encode('utf8')).decode('utf8')
|
|
except TypeError:
|
|
raise UnpackingError('MyObfuscate payload is not base64-encoded.')
|