How to Create Undetectable Python Payloads that Bypass Antiviruses – Kali Linux 2017.3

• 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.

Backdooring Module:

Encryption Module:

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 works:

• 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:

https://www.youtube.com/watch?v=ixOTKhTStMA&feature=youtu.be