Open-Source Tool for Shellcode Testing
Changelog:
v1.2 | 21 Feb 2026
[+] Added new CreateThread method to execute shellcode. This method is available for both 32 and 64 bit architectures.
[*] Added check when entering invalid method.
v1.1 | 20 Feb 2026
[+] 64-bit support: Added 64 bit architecture to load 64 bit shellcodes
[*] Other minor code improvements and refactoring.
Shellcode Loader is an open-source, lightweight command-line utility designed to load and test custom shellcodes.
This tool reads a user-supplied shellcode file and executes it directly within the memory space of its own process, allowing developers and security researchers to validate payload behavior in a controlled environment.
Some of our Shellcode Loader advantages:
- Supports both 32-bit and 64-bit shellcodes
- Works on any Windows from WinXP up to Win11
- Written in C
- Free & Open Source
Shellcode Loader v1.2 implements 4 different execution methods, to demonstrate how various techniques can be used to perform in-memory code execution:
- C Function
- Inline ASM
- CallWindowProc
- CreateThread
This tool is particularly useful for:
- Testing custom payloads in lab environments
- Security research and defensive analysis
- Learning how executable memory works
- Studying in-memory execution methods
⚠️ The tool must only be used after accepting our Terms of Service, in controlled environments and with explicit authorization.
BreakingSecurity does not support or condone illegal or unauthorized use of this software.