Malware Analysis Skill for Claude

Use when reverse-engineering or detecting malware — static triage + capa/YARA-X, emulation/DBI/.NET unpacking, dynamic/fileless/Volatility 3 memory analysis, C2 config extraction (Cobalt Strike/CAPE), C2 traffic detection (JA4+, beaconing)

24k tokens

context cost

the whole folder, loaded on every use

files

ships runnable scripts

copies elsewhere

how many repositories repackaged it

334

stars on the repo

on the repository, not the skill itself

Install

one command, takes just this skill from the repository

npx skills add https://github.com/hypnguyen1209/offensive-claude --skill malware-analysis

What comes with it

87 619 bytes besides the instruction

references/config-c2-extraction.md

references/dynamic-fileless-memory.md

references/network-c2-detection.md

references/static-triage-capa.md

references/unpacking-deobfuscation.md

references/yara-detection-engineering.md

scripts/auto_unpack.py

scripts/beacon_profiler.py

scripts/cs_config_extract.py

scripts/frida_unpack.js

scripts/mem_triage.py

scripts/triage.py

scripts/yara_gen.py

The instruction itself

6 sections, as written by the author

Malware Analysis

When to Activate

Triaging an unknown binary/script: identity, packing verdict, capability map, IOCs, go/no-go for detonation.
Recovering the real payload from a packed/crypted/obfuscated loader (commodity loaders, RAT chains, .NET).
Detonating safely and recovering fileless / in-memory artifacts (injection, AMSI/ETW patching, WMI persistence).
Extracting malware configuration (C2, keys, sleep/jitter, campaign IDs) for threat intel and detection.
Detecting/characterizing C2 on the wire (beacon cadence, JA4+ fingerprints, tunneled/DoH channels).
Writing durable, low-FP YARA-X detection from analysis findings; incident-response scoping.

Technique Map

|-----------|--------|-----|-----------|--------|

Quick Start

# 1. Static triage: hashes + PE anomalies + capability combos + FLOSS/capa/YARA-X
python3 scripts/triage.py sample.exe --floss --capa --yara rules/family.yar --json out/triage.json
capa -j sample.exe > out/capa.json                       # capabilities -> ATT&CK

# 2. Unpack (try emulation first; DBI fallback in isolated VM)
python3 scripts/auto_unpack.py sample.exe -o out/dumps/  # static emulation, no detonation
frida -f C:\sample.exe -l scripts/frida_unpack.js --no-pause   # DBI, isolated VM only
de4dot sample.exe -o cleaned.exe                         # .NET layer

# 3. Dynamic + memory (capture mem BEFORE remediation)
python3 scripts/mem_triage.py -f mem.raw --vol vol --patch-hunt --json out/mem.json

# 4. Config + C2 extraction
python3 scripts/cs_config_extract.py beacon.bin --json    # Cobalt Strike
python3 1768.py -S beacon.bin                             # full CS incl. runtime/heap config
configextractor sample.bin                               # MACO/MWCP/CAPE at scale

# 5. Network C2 detection
python3 scripts/beacon_profiler.py capture.pcap --min-beacons 6     # cadence/jitter
zeek -r capture.pcap LOCAL ja4 && zeek-cut ja4 ja4s ja4x < ja4.log  # JA4+ pivots

# 6. Detection engineering
python3 scripts/yara_gen.py --family samples/fam/ --name Fam --goodware /usr/bin --out rules/fam.yar
yara-x fmt rules/fam.yar && yara-x scan rules/fam.yar /corpus/

OPSEC & Detection (summary)

|-----------|---------------|------------------------|------------|

| DBI/manual unpack | Sysmon 8/10 (CallTrace UNKNOWN), RWX commit | EDR memory scan; RWX-then-exec Sigma | DETONATES — isolated VM, snapshot, FakeNet; loaders self-delete, dump first |

Deep Dives

references/static-triage-capa.md — Identity/code hashes, Rich header, entropy/packer heuristics, FLOSS, capa (PE/ELF/.NET/shellcode + dynamic capa over CAPE, Android rules, capa Explorer Web), FLARE-VM 2025.
references/unpacking-deobfuscation.md — Self-modifying-stub oracle, emulation (auto_unpack/unipacker/Speakeasy/Qiling), Frida DBI hooks, x64dbg→OEP→Scylla, .NET (de4dot/dnSpyEx), Latrodectus 1.4 AES strings, AsyncRAT fileless loaders, garble/pyc.
references/dynamic-fileless-memory.md — Sandbox build, Volatility 3 injection playbook + 2025 contest plugins (PEScan/Fileless Hunter), AMSI/ETW patch IOCs + patchless VEH bypass, WMI/registry/PS fileless persistence.
references/config-c2-extraction.md — Cobalt Strike (1768.py runtime config, CobaltStrikeParser XOR 0x69/0x2e), AdaptixC2 (Unit 42, 2025), MACO/configextractor-py/CAPEv2 at scale, generic unknown-C2 decoder methodology.
references/network-c2-detection.md — Beacon cadence/CV scoring, JA4+ suite (JA4X for randomized-cert Sliver/Havoc, Zeek/TheHive 2025-26), tunneled/DoH C2 (cloudflared/TryCloudflare/chisel), Suricata/Sigma + ransomware 2025 tradecraft.
references/yara-detection-engineering.md — YARA-X 1.0 (Rust, 99% compat, fmt/WASM, perf caveats), code/byte > string rules, pe/math modules, threshold logic, goodware FP validation, memory+disk scanning, capa pairing.

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How to use it

Copy the folder

Take hypnguyen1209/malware-analysis from the repository into ~/.claude/skills for personal use, or into .claude/skills inside a project.

Check the name does not clash

The agent identifies a skill by the name field in its header. Two skills with the same name cannot sit side by side — one of them will be ignored.