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utsavthakur
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vm-and-bytecode-reverse

Reverse engineer custom virtual machines and bytecode interpreters with Python.

Updated Jun 11, 2026
Search Tags:#bytecode#reverse engineering#CTF#disassembler#VM analysis
One-click install
npx skills add https://github.com/utsavthakur/agenticskills --skill vm-and-bytecode-reverse-utsavthakur
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: vm-and-bytecode-reverse
Source: https://github.com/utsavthakur/agenticskills/tree/main/vm-and-bytecode-reverse
Command: npx skills add https://github.com/utsavthakur/agenticskills --skill vm-and-bytecode-reverse-utsavthakur

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill requires python, IDA Pro, Ghidra, angr, and includes scripts (resource) and references (resource) and assets (resource) components.

What problem does it solve?

This Skill provides expert techniques for reversing custom virtual machines and bytecode interpreters, solving CTF challenges and analyzing protected software.

Core Features & Use Cases

  • Custom VM Identification: Detects and identifies dispatcher loops, opcode mapping, and custom ISA reconstruction.
  • Disassembler/Decompiler Writing: Assists in creating disassemblers and decompilers for VM bytecode.
  • Maze Challenges: Solves maze-style VM challenges by extracting grids and applying pathfinding algorithms.
  • Real-World VM Protectors: Analyzes common VM protectors like VMProtect and Themida, offering deobfuscation techniques.

Quick Start

Use the vm-and-bytecode-reverse skill to analyze a custom VM bytecode from the file 'vm-bytecode.bin'.

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 identify the dispatcher loop in custom VM bytecode?▼

To identify the dispatcher loop in custom VM bytecode, analyze the control flow for a central switch statement or jump table that routes execution based on opcodes. This Skill pinpoints these dispatcher mechanisms to start mapping the custom instruction set architecture.

What is the best way to write a disassembler for a custom bytecode interpreter?▼

The best way to write a disassembler for a custom bytecode interpreter is to map out the opcode handlers and reconstruct the custom ISA. This Skill provides expert techniques to translate raw VM bytecode into readable assembly instructions.

How do I solve maze challenges in CTF VM bytecode?▼

To solve maze challenges in CTF VM bytecode, extract the embedded grid layout from the bytecode and apply pathfinding algorithms. This Skill assists in analyzing the VM interpreter to reveal the maze structure and valid paths.

Can I use IDA Pro and Ghidra to analyze VM protectors like VMProtect?▼

Yes, you can use IDA Pro and Ghidra to analyze real-world VM protectors like VMProtect and Themida. This Skill integrates with these dependencies to provide deobfuscation techniques for protected software.

Do I need Python to reverse engineer custom virtual machines?▼

Yes, you need Python to reverse engineer custom virtual machines using this Skill. Python is required for executing analysis scripts, writing custom disassemblers, and automating bytecode extraction tasks.

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