NXcrypt - Python Backdoor Framework

June 20, 2017  , , ,  


NXcrypt
  • NXcrypt is a polymorphic 'python backdoors' crypter written in python by Hadi Mene (h4d3s) . The output is fully undetectable .
  • NXcrypt can inject malicious python file into a normal file with multi-threading system .
  • Run it with superuser's permissions .
  • NXcrypt output is Fully undetectable .

Usage :
  • sudo ./NXcrypt.py --file=backdoor.py --output=output_backdoor.py # encrypt backdoor.py and output file is output_backdoor.py
  • sudo ./NXcrypt.py --file=shell.py # encrypt shell.py and default output file is backdoor.py but you can edit it in source code
  • sudo ./NXcrypt.py --help # NXcrypt help
  • sudo ./NXcrypt.py --backdoor-file=payload.py --file=test.py --output=hacked.py # inject payload.py with test.py into hacked.py with multi-threading system

How it work ?
  • Encryption module :
  • NXcrypt add some junkcode .
  • NXcrypt use a python internal module 'py_compile' who compile the code into bytecode to a .pyc file .
  • NXcrypt convert .pyc file into normal .py file .
  • And in this way we can obfuscate the code
  • The md5sum will change too
  • Injection module :
  • it inject a malicious python file into a normal file with multi-threading system .

Test with Virustotal
Before :
SHA256: e2acceb6158cf406669ab828d338982411a0e5c5876c2f2783e247b3e01c2163 File name: facebook.py Detection ratio: 2 / 54
After :
SHA256: 362a4b19d53d1a8f2b91491b47dba28923dfec2d90784961c46213bdadc80add File name: facebook_encrypted.py Detection ratio: 0 / 55

Video Tutorial
https://www.youtube.com/watch?v=s8Krngv2z9Q