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CTF Reverse Engineering · ljagiello | DecimalAI

securityby ljagiello

CTF Reverse Engineering

ljagiello/ctf-reverse

Source ljagiello/ctf-skills ↗License MIT

Provides reverse engineering techniques for CTF challenges.

SkillScore78Maintained

Automatic

Security & AppSec pack

Last verified 9/19/2026

What it changes

Passed 17 of 22 test cases with the skill, and 9 of 22 without it.

Without skill39%

With skill78%

Checks it passed that the model alone missed

Specifies r2pm -ci r2ghidra for plugin installation.
Directs pivoting to /ctf-crypto for cryptographic analysis.
Recommends strace -f -s 500 ./binary for system call interception.

and 6 more in the full report

9 fixed9 passed either way5 still failing0 broke

Pass-rate lift: +39 pp
Tokens: +132%
Agent turns: 0%
Response time: -2%

Model Measured 9/19/2026v2 · latest is v318 of 23 cases passed with skill · 22 comparable

Tokens, turns and time describe resource use, not a dollar price.

This benchmark measured an earlier version of the skill.

A newer attempt on gemini-3.8-flash on 10/18/2026 did not produce a publishable comparison (not comparable). The snapshot above is the previously measured run.

Use this skill

Save it into your project's skills folder. Claude Code picks it up in its next session.

curl -fsSL --create-dirs -o .claude/skills/ljagiello-ctf-reverse/SKILL.md https://app.decimal.ai/s/ljagiello-ctf-reverse/SKILL.md

Want it pinned and updatable? pip install "decimalai>=0.15", then decimalai skills add ljagiello-ctf-reverse, and start Claude Code with claude --plugin-dir "$(git rev-parse --show-toplevel)/.agents"

1 · One-time — install the CLI (docs ↗)

pip install "decimalai>=0.15"

2 · Get the skill — writes .agents/skills/ljagiello-ctf-reverse/ and pins it in .decimal/skills.lock

decimalai skills add ljagiello-ctf-reverse

No CLI? Get the same file — curl · raw file

curl -fsSL --create-dirs -o .claude/skills/ljagiello-ctf-reverse/SKILL.md https://app.decimal.ai/s/ljagiello-ctf-reverse/SKILL.md

Raw file: /s/ljagiello-ctf-reverse/SKILL.md ↗ · machine-readable summary at /s/ljagiello-ctf-reverse.json ↗

Safety checks: 3 of 3 passed

Code scan CleanIntent PassedContent Clean

See it in action

One of 8 test cases the skill fixed. Same model, same prompt, with and without the skill.

1 of 8

Prompt

I am configuring radare2 on a Linux RE box and want to integrate native Ghidra decompilation inside the radare2 interface. What package command installs this decompiler plugin through radare2's package manager?

What was checked, without and with the skill
Checked	Without skill	With skill
Specifies r2pm -ci r2ghidra for plugin installation.	Missed	Passed

case-08 · gemini-3.6-flash · 9/19/2026 · answers are capped and redacted

What's inside

The instructions your model reads when the skill loads.

SKILL.md178 linessingle file

CTF Reverse Engineering

Quick reference for RE challenges. For detailed techniques, see supporting files.

Prerequisites

Python packages (all platforms):

pip install frida-tools angr qiling uncompyle6 capstone lief z3-solver
# For Python 3.9+ bytecode: build pycdc from source
git clone https://github.com/zrax/pycdc && cd pycdc && cmake . && make

Linux (apt):

apt install gdb radare2 binutils strace ltrace apktool upx

macOS (Homebrew):

brew install gdb radare2 binutils apktool upx ghidra

radare2 plugins:

r2pm -ci r2ghidra   # Native Ghidra decompiler for radare2

Manual install:

pwndbg — Linux: GitHub, macOS: brew install pwndbg/tap/pwndbg-gdb

MCP servers (optional, agent-driven RE): IDA Pro MCP (mrexodia/ida-pro-mcp), Ghidra MCP (bethington/ghidra-mcp — has a headless server, no GUI needed), JADX MCP (zinja-coder/jadx-ai-mcp) — see tools-mcp.md for setup and usage.

Additional Resources

unicorn-emulation.md - Unicorn CPU emulation: raw binary assembly emulation, hooks, ARM/MIPS/Thumb, mixed-mode, firmware MMIO, Keystone+Capstone trace inversion, shellcode unpack, custom VM, vs Qiling decision (sometimes easier to rev with just unicorn + binary + assembly than full GDB/angr)
tools.md - Static analysis tools (GDB, Ghidra, radare2, IDA, Binary Ninja, dogbolt.org, RISC-V with Capstone, Unicorn emulation, Python bytecode, WASM, Android APK, .NET, packed binaries)
tools-mcp.md - MCP server integration (agent-driven RE): IDA Pro MCP (GUI plugin + idalib headless), Ghidra MCP (headless server, no GUI), JADX MCP (Android APK/DEX), plus crossing the JNI boundary by dlopen-ing an Android .so on the host instead of decompiling it
tools-dynamic.md - Dynamic analysis tools: Frida (hooking, anti-debug bypass, memory scanning, Android/iOS), angr symbolic execution (path exploration, constraints, CFG), lldb (macOS/LLVM debugger), x64dbg (Windows)
tools-emulation.md - Emulation frameworks and side-channel tooling: Qiling (cross-platform OS-level emulation), Triton (DSE), Intel Pin instruction-counting + genetic algorithm side channel, opcode-only trace reconstruction, LD_PRELOAD time freeze and memcmp side-channel for byte-by-byte bruteforce

Track record

Benchmark

17 / 22

test cases passed, vs 9 / 22 without

Adoption

Users: 0
Times used: 0

Safety and source details

SkillSafety

✓ 3 of 3 passed

Code scan15 of 15 checks clean

0 critical · 0 warning · 0 info — scanner v6 — 10/16/2026

View 15 scanner checks

live_secretremote_code_executionreverse_shelldata_exfiltrationssrf_metadataagent_snoopinganti_refusaldestructive_commandsobfuscated_unicodeunicode_homoglyphopaque_blobsuspicious_urltool_overreachtrigger_abuseprompt_injection_phrasing

IntentSafe

LLM judge · does the skill do what it claims

ContentClean

LLM judge · policy & harmful-content review

Source

Imported

ljagiello / ctf-skills

ctf-reverse/SKILL.md

View on GitHub ↗

License MITImported 10/16/2026Version v3

Other skills for the same job

Published skills whose descriptions closely match this one, with their headline benchmark lift.

hypnguyen1209/reverse-engineeringUse when reverse-engineering a binary or firmware — static triage + decompilation (Ghidra/IDA/Binary Ninja), dynamic instrumentation (GDB/Frida 17/angr), anti-reversing & packer bypass, OLLVM/VM deobfuscation, UEFI/BIOS RE & Secure Boot research, patch-diffing for n-daysClose match+45 pp pass-rate lift

More skills from the same source and nearby in the registry, with their headline benchmark lift.

Ready to supercharge your AI agents?

See it in action

What's inside

CTF Reverse Engineering

Prerequisites

Additional Resources

Track record

Benchmark

Adoption

SkillSafety

Source

Other skills for the same job

Related skills