vm-and-bytecode-reverse

Identify VM dispatcher patterns and map opcodes to build a custom disassembler.

120|8|Updated Jun 2, 2026
One-click install
npx skills add https://github.com/Prohao42/aimy-sikll --skill vm-and-bytecode-reverse-prohao42
Or copy as Structured Prompt for Agent
Please help me install this Agent Skill.
Skill: vm-and-bytecode-reverse
Source: https://github.com/Prohao42/aimy-sikll/tree/main/ai-mian/hack-skills/skills/vm-and-bytecode-reverse
Command: npx skills add https://github.com/Prohao42/aimy-sikll --skill vm-and-bytecode-reverse-prohao42

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

VM bytecode interpreters often hide their dispatch loops and opcode semantics, making it hard to analyze challenges or protected software without a reproducible workflow.

Core Features & Use Cases

  • Identify dispatcher patterns (switch, table, indirect) in VM interpreters.
  • Reconstruct ISA by mapping opcodes to operations and produce a custom disassembler.
  • Solve maze-style bytecode challenges and nested VM layers in CTFs or protected software.

Quick Start

Disassemble the provided bytecode, map opcodes to operations, and document the dispatcher pattern to enable step-by-step analysis.

Frequently Asked Questions about vm-and-bytecode-reverse

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I reverse engineer a custom VM bytecode interpreter?

To reverse engineer custom VM bytecode, identify the dispatcher pattern, map opcodes to operations to reconstruct the instruction set architecture, and build a reproducible disassembler for step-by-step analysis.

How does a VM dispatcher loop work in protected software?

A VM dispatcher loop works by reading bytecode instructions and routing execution to handler blocks via switch statements, jump tables, or indirect calls, hiding the original program logic.

What is the best way to solve maze-style bytecode challenges in CTFs?

The best way to solve maze-style bytecode challenges is to disassemble the provided bytecode, map the opcode semantics, and document the dispatcher pattern to trace the maze path logic.

How do I build a custom disassembler for unknown bytecode?

You build a custom disassembler for unknown bytecode by identifying the VM dispatcher, extracting opcode-to-operation mappings, and scripting the reconstruction of the instruction set architecture.

Can I use this methodology to analyze nested VM layers in CTF challenges?

Yes, you can apply the dispatcher identification and opcode mapping methodology to handle nested VM layers, enabling reproducible bytecode reconstruction across multiple interpreter levels.

Why does identifying the dispatcher pattern matter in bytecode reverse engineering?

Identifying the dispatcher pattern matters because it reveals how opcodes are routed to handler blocks, which is the critical first step to mapping opcode semantics and reconstructing the hidden instruction set architecture.