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ljagiello/ctf-reverse

Fornece técnicas de engenharia reversa para desafios de CTF. Use quando a principal tarefa for entender como um alvo compilado, ofuscado, empacotado ou virtualizado funciona antes de explorá-lo ou resolvê-lo.

O que é ctf-reverse?

Esta skill é especializada em engenharia reversa para desafios de Capture The Flag (CTF). Ela é ideal para situações em que você precisa analisar binários compilados, APKs, WASM, firmware, máquinas virtuais personalizadas, bytecode, clientes de jogos, loaders semelhantes a malware ou lógicas anti-debug e anti-análise. A principal utilidade da skill é ajudar a entender o funcionamento interno de um alvo antes de explorá-lo ou solucioná-lo. Ela deve ser usada quando a principal dificuldade do desafio está em compreender como o software funciona, e não na exploração de vulnerabilidades já conhecidas. A skill suporta uma ampla gama de plataformas e formatos de arquivo, e suas instruções detalhadas incluem métodos como análise estática com desassembladores (Ghidra, IDA Pro, Binary Ninja), análise dinâmica com depuradores (GDB, LLDB, WinDbg), desofuscação de código, extração de strings, identificação de ofuscação de fluxo de controle (CFG), análise de criptografia personalizada e muito mais. Ela é particularmente valiosa para engenheiros reversos, participantes de CTF e profissionais de segurança ofensiva que precisam de um guia abrangente e prático para enfrentar desafios complexos de engenharia reversa.

Funciona com~Claude Code~Codex CLI~Cursor
npx skills add https://github.com/ljagiello/ctf-skills/tree/main/skills/ctf-reverse

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Documentação

O que ctf-reverse faz?

Fornece técnicas de engenharia reversa para desafios de CTF. Use quando a principal tarefa for entender como um alvo compilado, ofuscado, empacotado ou virtualizado funciona antes de explorá-lo ou resolvê-lo, incluindo binários, APKs, WASM, firmware, VMs personalizadas, bytecode, clientes de jogos, loaders do tipo malware e lógicas anti-debug ou anti-análise. Não use quando a vulnerabilidade já for compreendida e a tarefa restante for a exploração; use pwn. Não use para fluxos de trabalho puramente web, perícia de logs ou discos, ou problemas criptográficos isolados, a menos que reverter a implementação seja o verdadeiro obstáculo.

Individual skills in this repo

This repo contains 10 individual skills — each has its own dedicated page.

ljagiello/ctf-ai-ml

Provides AI and machine learning techniques for CTF challenges. Use when attacking ML models, crafting adversarial examples, performing model extraction, prompt injection, membership inference, training data poisoning, fine-tuning manipulation, neural network analysis, LoRA adapter exploitation, LLM jailbreaking, or solving AI-related puzzles.

ljagiello/ctf-crypto

Provides cryptography attack techniques for CTF challenges. Use when attacking encryption, hashing, signatures, ZKP, PRNG, or mathematical crypto problems involving RSA, AES, ECC, lattices, LWE, CVP, number theory, Coppersmith, Pollard, Wiener, padding oracle, GCM, key derivation, or stream/block cipher weaknesses.

ljagiello/ctf-forensics

Provides digital forensics and signal analysis techniques for CTF challenges. Use when analyzing disk images, memory dumps, event logs, network captures, cryptocurrency transactions, steganography, PDF analysis, Windows registry, Volatility, PCAP, Docker images, coredumps, side-channel power traces, DTMF audio spectrograms, packet timing analysis, CD audio disc images, or recovering deleted files and credentials.

ljagiello/ctf-malware

Provides malware analysis and network traffic techniques for CTF challenges. Use when analyzing obfuscated scripts, malicious packages, custom crypto protocols, C2 traffic, PE/.NET binaries, RC4/AES encrypted communications, YARA rules, shellcode analysis, memory forensics for malware (Volatility malfind, process injection detection), anti-analysis techniques (VM/sandbox detection, timing evasion, API hashing, process injection, environment checks), or extracting malware configurations and indicators of compromise.

ljagiello/ctf-misc

Provides miscellaneous CTF challenge techniques for problems that do not cleanly fit the main categories. Use for encoding puzzles, pyjails, bash jails, RF/SDR, DNS oddities, unicode tricks, esoteric languages, QR or audio puzzles, constraint solving, game theory, unusual sandbox escapes, and hybrid logic puzzles. Prefer a more specific skill first when the challenge is mainly web, pwn, reverse, forensics, malware, OSINT, or crypto. Treat this as the fallback skill for genuine cross-category or edge-case challenges, not the default starting point.

ljagiello/ctf-osint

Provides open source intelligence techniques for CTF challenges. Use when gathering information from public sources, social media, geolocation, DNS records, username enumeration, reverse image search, Google dorking, Wayback Machine, Tor relays, FEC filings, or identifying unknown data like hashes and coordinates.

ljagiello/ctf-pwn

Provides binary exploitation techniques for CTF challenges. Use when you already have a vulnerable native target or service and need to turn memory corruption or low-level primitives into code execution or privilege escalation, such as buffer overflows, format strings, heap bugs, ROP, ret2libc, shellcode, kernel exploitation, seccomp bypass, sandbox escape, or Windows/Linux exploit chains. Do not use it when the main blocker is understanding what the binary does; use reverse engineering first. Do not use it for pure web bugs, disk or packet forensics, or standalone crypto/math challenges.

ljagiello/ctf-web

Provides web exploitation techniques for CTF challenges. Use when the target is primarily an HTTP application, API, browser client, template engine, identity flow, or smart-contract frontend/backend surface, including XSS, SQLi, SSTI, SSRF, XXE, JWT, auth bypass, file upload, request smuggling, OAuth/OIDC, SAML, prototype pollution, and similar web bugs. Do not use it for native binary memory corruption, reverse engineering of standalone executables, disk or memory forensics, or pure cryptanalysis unless the web flaw is still the main path to the flag.

ljagiello/ctf-writeup

Generates a single standardized submission-style CTF writeup for competition handoff and organizer review. Use after solving a CTF challenge to document the solution steps, tools used, and lessons learned in a structured format.

ljagiello/solve-challenge

Solves CTF challenges by performing first-pass triage, identifying the dominant category, and routing execution to the right specialized ctf-* skill. Use when the user gives you a challenge bundle, a remote service, a suspicious file, or only a vague challenge description and you must determine where to start. Do not use it when the category is already clear and a specialized skill can be invoked directly; this is the dispatcher and recon entrypoint, not the deepest reference for category-specific techniques.

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