Leveraging C# with Venom: Advanced Shellcode Generation and Injection Techniques

 

About Venom in C#

Venom is a powerful MetaSploit shellcode generation, compilation, and processing tool. It uses msfvenom (MetaSploit) to generate shellcode in different formats. Supported programming languages and formats include C#, Python, Ruby, DLL, MSI, HTA PSH, DOCM, APK, Mach-O, ELF, DEB, MP4, and more. The generated shellcode will be injected into a template (using Python as an example), where a Python function will execute the shellcode in memory. It employs compilers such as GCC (GNU Cross Compiler), mingw32, or PyInstaller to build executables. Additionally, the tool initiates a handler responsible for receiving remote connections (Shell or Meterpreter).

It is noteworthy that Venom also references certain techniques from the scripts Veil-Evasion.py, unicorn.py, and powersploit.py.

C#: Dependencies

Zenity

Metasploit

GCC Compiler

PyInstaller Compiler

mingw32 Compiler

pyherion.py Crypter

Wine Emulator

PEScrambler.exe (PE Obfuscation Tool)

Apache2 (Web Server)

WinRAR

Shellter

vbs-obfuscator (Obfuscation Tool)

Avet

Ettercap (MitM + DNS_Spoofing)

ICMPSH (ICMP Shell)

OpenSSL (for constructing SSL certificates)

CarbonCopy

ResourceHacker

NXcrypt

Venom will download/install all dependencies as needed. The project-provided venom-main/aux/setup.sh script will help us quickly install all framework dependencies.

 

C# Tool Download/Installation

First, we need to clone the project’s source code to our local environment using the following command:

git clone https://github.com/r00t-3xp10it/venom.git

Next, execute the following commands to grant execute permissions to the scripts:

cd venom
sudo find ./ -name "*.sh" -exec chmod +x {} \;
sudo find ./ -name "*.py" -exec chmod +x {} \;

Then install all required dependencies for the tool using the following command:

cd aux && sudo ./setup.sh

After installation is complete, we can run the main program of the tool directly:

sudo ./venom.sh

To update the Venom version, you can directly run the following command:

sudo ./venom.sh -u

 

Tool Run Screenshots

 

Project Address

Venom:https://github.com/r00t-3xp10it/venom

Recommended Highlights

CompilationCompilerToolScriptPermissions