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MAC Address Shellcode Execution with XOR Encryption

This project demonstrates how to encrypt shellcode using XOR, format it as MAC addresses for obfuscation, and then decrypt and execute it in a Windows environment using Nim.

Overview

The process involves two main steps:

  1. Encryption: A Python script reads a binary shellcode file, encrypts it using XOR, and formats the encrypted data as MAC addresses.
  2. Decryption and Execution: A Nim script reads the encrypted MAC addresses, decrypts the data using XOR, and executes the shellcode using Windows fibers.

Files

  • encrypt_shellcode.py: The Python script that encrypts shellcode and outputs it in MAC address format.
  • macinject2.nim: The Nim script that decrypts the MAC address formatted shellcode and executes it.

Requirements

Python

  • Python 3.x
  • encrypt_shellcode.py does not require any external libraries.

Nim

  • Nim 1.x or higher
  • The winim Nim package for Windows API functions.

Usage

Step 1: Encrypt Shellcode

First, use the Python script to encrypt your shellcode and format it as MAC addresses.

python encrypt_shellcode.py shellcode.bin

Replace shellcode.bin with the path to your binary shellcode file. The script will output the encrypted shellcode in MAC address format.

Step 2: Update the Nim Script

Copy the output from the Python script and replace the encryptedMAC array in macinject2.nim with the generated MAC addresses.

Step 3: Compile and Run the Nim Script

Finally, compile and run the Nim script to execute the decrypted shellcode.

nim c -r macinject2.nim

Running the Nim Script

Compile and run the Nim script:

nim c -r macinject2.nim

Notes

Ensure that the XOR key used in both the Python and Nim scripts is the same. The project is intended for educational purposes and should be used responsibly.