mirror of
https://github.com/Grasscutters/mitmproxy.git
synced 2024-12-04 20:47:25 +00:00
87 lines
2.8 KiB
Python
87 lines
2.8 KiB
Python
#
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# deobfuscator for scripts messed up with myobfuscate.com
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# by Einar Lielmanis <einar@jsbeautifier.org>
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#
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# written by Stefano Sanfilippo <a.little.coder@gmail.com>
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#
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# usage:
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#
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# if detect(some_string):
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# unpacked = unpack(some_string)
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#
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# CAVEAT by Einar Lielmanis
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#
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# You really don't want to obfuscate your scripts there: they're tracking
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# your unpackings, your script gets turned into something like this,
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# as of 2011-08-26:
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#
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# var _escape = 'your_script_escaped';
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# var _111 = document.createElement('script');
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# _111.src = 'http://api.www.myobfuscate.com/?getsrc=ok' +
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# '&ref=' + encodeURIComponent(document.referrer) +
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# '&url=' + encodeURIComponent(document.URL);
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# var 000 = document.getElementsByTagName('head')[0];
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# 000.appendChild(_111);
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# document.write(unescape(_escape));
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#
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"""Deobfuscator for scripts messed up with MyObfuscate.com"""
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import re
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import base64
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# Python 2 retrocompatibility
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# pylint: disable=F0401
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# pylint: disable=E0611
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try:
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from urllib import unquote
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except ImportError:
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from urllib.parse import unquote
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from jsbeautifier.unpackers import UnpackingError
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PRIORITY = 1
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CAVEAT = """//
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// Unpacker warning: be careful when using myobfuscate.com for your projects:
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// scripts obfuscated by the free online version call back home.
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//
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"""
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SIGNATURE = (r'["\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4A\x4B\x4C\x4D\x4E\x4F'
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r'\x50\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5A\x61\x62\x63\x64\x65'
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r'\x66\x67\x68\x69\x6A\x6B\x6C\x6D\x6E\x6F\x70\x71\x72\x73\x74\x75'
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r'\x76\x77\x78\x79\x7A\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x2B'
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r'\x2F\x3D","","\x63\x68\x61\x72\x41\x74","\x69\x6E\x64\x65\x78'
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r'\x4F\x66","\x66\x72\x6F\x6D\x43\x68\x61\x72\x43\x6F\x64\x65","'
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r'\x6C\x65\x6E\x67\x74\x68"]')
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def detect(source):
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"""Detects MyObfuscate.com packer."""
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return SIGNATURE in source
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def unpack(source):
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"""Unpacks js code packed with MyObfuscate.com"""
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if not detect(source):
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return source
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payload = unquote(_filter(source))
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match = re.search(r"^var _escape\='<script>(.*)<\/script>'",
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payload, re.DOTALL)
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polished = match.group(1) if match else source
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return CAVEAT + polished
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def _filter(source):
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"""Extracts and decode payload (original file) from `source`"""
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try:
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varname = re.search(r'eval\(\w+\(\w+\((\w+)\)\)\);', source).group(1)
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reverse = re.search(r"var +%s *\= *'(.*)';" % varname, source).group(1)
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except AttributeError:
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raise UnpackingError('Malformed MyObfuscate data.')
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try:
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return base64.b64decode(reverse[::-1].encode('utf8')).decode('utf8')
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except TypeError:
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raise UnpackingError('MyObfuscate payload is not base64-encoded.')
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