Red Teamer’s Cookbook: BYOI (Bring Your Own Interpreter)

This blog post introduces and demonstrates BYOI (Bring Your Own Interpreter) tradecraft: embedding a .NET scripting language (Boolang/Boo) inside PowerShell to dynamically compile and execute code in-memory, bypass AMSI and ScriptBlock logging, and implement a simple HTTP-based C2 for delivering source. It covers .NET fundamentals, a step-by-step PoC implant, detection difficulties, and suggested defensive mitigations to raise the bar against this technique.