本文へ移動
cccskills
無料GitHub で公開

building-config-extractors

Builds reusable malware configuration extractors by applying a declarative JSON spec (offsets, decode layers, field definitions) to a sample to produce structured, defanged config. Activates for requests to build a config extractor, write a reusable family config parser, or run a spec-driven configuration extraction.

インストール方法を見る

含まれるファイル(4)

  • SKILL.md2.7 KB
  • LICENSE340 B
  • references/api-reference.md1.5 KB
  • scripts/analyst.py3.4 KB

SKILL.md(原文)

インストールする前に、エージェントに与えられる指示の中身を確認できます。

Building Config Extractors

When to Use

  • You have reversed a family's config format and want a reusable, declarative extractor instead of one-off scripts.
  • You need to apply a spec (offset, XOR/base64 layers, field map) to many samples and emit structured, defanged config.

Do not use a spec built for one variant blindly on another — re-verify offsets/keys per variant. This skill reads samples statically and executes nothing.

Prerequisites

  • A reversed understanding of the config (location, decode layers, fields) expressed as a JSON spec.

Safety & Handling

  • Read bytes statically; defang recovered endpoints in output.

Workflow

Step 1: Write the extraction spec

Define a JSON spec: blob offset/length (or a marker to search), ordered decode layers (xor with key, base64), and fields (name, offset, length, type: str/u16/u32/ipv4).

Step 2: Run the extractor

python scripts/analyst.py extract sample.bin --spec family.json

Locates the blob, applies decode layers, parses fields, and defangs URL/IP fields.

Step 3: Validate output

Confirm fields are plausible (valid hosts, ports, IDs); adjust the spec as needed.

Step 4: Reuse

Store the spec per family and apply across the corpus.

Validation

  • The spec round-trips on a known sample to the expected config.
  • Decode layers are applied in order and produce readable output.
  • URL/IP fields are defanged in the emitted config.

Pitfalls

  • Hardcoding a variant-specific offset that shifts in other builds — prefer markers.
  • Wrong field endianness (u16/u32 little vs big) producing garbage ports.
  • Forgetting a decode layer (base64 over XOR) and parsing ciphertext as fields.

References

  • See references/api-reference.md for the extractor engine.
  • ATT&CK T1140 and config-extractor framework concepts (linked in frontmatter).

レビュー

まだレビューはありません。使ってみた感想をお寄せください。

同じリポジトリのスキル

概要と使いどころ

Reverses Android malware: unpacking APKs, decompiling DEX bytecode to readable Java, auditing the manifest for abused permissions and components, and locating dynamically loaded or native payloads. Activates for requests to analyze an APK, decompile DEX, or investigate a suspicious Android app.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack222026年7月7日 更新

Analyzes API call traces from a sandbox or API monitor (JSON) to group calls by category, reconstruct high-level behaviors (process injection, file drops, network, crypto), and flag suspicious call sequences. Activates for requests to analyze an API trace, interpret sandbox API logs, or identify behavior from Win32/Native API calls.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack222026年7月7日 更新

Analyzes Windows Authenticode signatures on PE files: checking for a signature, reading the signer certificate chain, detecting revoked/expired/stolen certs, and recognizing signature-stripping and catalog-signing abuse. Activates for requests to analyze a code signature, verify Authenticode, or assess signer trust on a PE.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack222026年7月7日 更新

Analyzes banking trojan webinject configurations to extract targeted institutions, injected JavaScript/HTML, and data-theft hooks, mapping the fraud workflow. Activates for requests to analyze banking trojan webinjects, parse a webinject config, or map targeted banks and credential-theft injections.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack222026年7月7日 更新

Analyzes Python-based malware packaged as PyInstaller/py2exe executables by detecting the packer, locating the embedded archive, and identifying bundled .pyc modules for extraction and decompilation. Activates for requests to analyze compiled Python malware, unpack a PyInstaller binary, or extract pyc modules from a frozen Python executable.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack222026年7月7日 更新

Analyzes cryptojacking/coinminer malware by extracting mining pool endpoints (stratum), wallet addresses, algorithm and miner identifiers (XMRig and forks), and persistence or resource-control settings from static strings and config. Activates for requests to analyze a cryptominer, extract mining pool and wallet IOCs, or identify coinminer configuration.

日本語の概要は準備中です。原文の説明を表示しています。

meltedinhex/analyst-ai-pack222026年7月7日 更新

meltedinhex のスキルをすべて見る

このスキルの問題を報告する