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Welcome to Building a C2 Framework in Go

Welcome to this comprehensive 16-hour course where you’ll build a complete Command and Control (C2) framework from scratch using Go.

What You’ll Learn

In this course, you’ll develop a fully functional C2 framework with:

  • Multiple Communication Protocols - HTTPS and DNS-based communication channels
  • Protocol Switching - Dynamic transition between protocols based on operational needs
  • Secure Communications - HMAC authentication and payload encryption
  • Command Infrastructure - Full command queuing, validation, and execution pipeline
  • Agent Execution Framework - Modular architecture for running commands on target systems
  • Shellcode Execution - Reflective DLL loading on Windows targets
  • Persistence Mechanisms - Registry-based persistence for agent survival

Course Philosophy

This course follows a “build to understand” approach. Rather than using existing C2 frameworks, you’ll construct every component yourself. This gives you:

  1. Deep Understanding - Know exactly how C2 frameworks work under the hood
  2. Customization Skills - Ability to modify and extend any C2 tool
  3. Detection Knowledge - Understanding attack patterns helps with defense
  4. Go Proficiency - Practical experience with a language ideal for security tooling

Prerequisites

  • Basic Go programming knowledge (functions, structs, interfaces)
  • Understanding of HTTP/HTTPS concepts
  • Familiarity with DNS basics
  • Access to a Windows VM for testing (shellcode execution)
  • A Linux or macOS development environment

Course Structure

The course is divided into logical sections:

  1. Foundation (Lessons 1-4) - Core interfaces, HTTPS server/agent, and run loop
  2. Multi-Protocol (Lessons 5-7) - DNS communication channel
  3. Protocol Management (Lessons 8-10) - Switching and dual-server architecture
  4. Security (Lessons 11-12) - Authentication and encryption
  5. Command System (Lessons 13-16) - Full command pipeline
  6. Execution Framework (Lessons 17-20) - Agent execution and shellcode loading
  7. Completion (Lessons 21-23) - Results handling, file operations, persistence

Ready to Begin?

Head to the Setup page to configure your development environment, then proceed to What We’ll Build for an architectural overview.