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vm-and-bytecode-reverse

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Custom VM and bytecode reverse engineering playbook. Use when CTF challenges or protected software implement custom virtual machines with proprietary bytecode, dispatcher loops, or maze-style challenges.

skills/vm-and-bytecode-reverse/SKILL.md

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# SKILL: VM & Bytecode Reverse Engineering — Expert Analysis Playbook

> **AI LOAD INSTRUCTION**: Expert techniques for reversing custom virtual machines and bytecode interpreters. Covers dispatcher identification, opcode mapping, custom ISA reconstruction, disassembler/decompiler writing, maze challenges, and real-world VM protector analysis. Base models often fail to recognize the fetch-decode-execute pattern or attempt to analyze VM bytecode as native code.

## 0. RELATED ROUTING

- [code-obfuscation-deobfuscation](../code-obfuscation-deobfuscation/SKILL.md) when the VM is a commercial protector (VMProtect/Themida)
- [symbolic-execution-tools](../symbolic-execution-tools/SKILL.md) when using angr to solve VM-based challenges
- [anti-debugging-techniques](../anti-debugging-techniques/SKILL.md) when the VM includes anti-debug checks

### Quick identification

| Binary Pattern | Likely VM Type | Start With |
|---|---|---|