本文へ移動
cccskills
無料GitHub で公開

extracting-and-classifying-strings

Extracts ASCII and Unicode strings from a binary and classifies them into investigative categories: URLs, IPs, file paths, registry keys, mutexes, commands, and API names, prioritizing the analyst's attention. Activates for requests to extract strings, classify strings output, or pull human-readable artifacts from a sample.

インストール方法を見る

含まれるファイル(4)

  • SKILL.md2.9 KB
  • LICENSE340 B
  • references/api-reference.md1.1 KB
  • scripts/analyst.py2.6 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。

Extracting and Classifying Strings

When to Use

  • You are triaging a sample and want quick investigative leads from its readable strings.
  • You need both ASCII and UTF-16LE (Unicode) strings, which many tools miss by default.
  • You want strings grouped by meaning (URLs, paths, registry, commands) rather than a flat dump.

Do not use plaintext strings as the whole story for packed/obfuscated samples — the useful strings may be encrypted; pair with entropy checks and deobfuscation (FLOSS) when the dump is sparse.

Prerequisites

  • Python (stdlib) or strings/FLOSS; the sample handled inertly in the lab.

Safety & Handling

  • Extract strings from the inert file; never execute the sample.
  • Defang any URLs/IPs before putting them in a report or ticket.

Workflow

Step 1: Extract ASCII and Unicode strings

Pull printable runs at a minimum length (default 4–5) for both ASCII and UTF-16LE encodings to avoid missing Windows wide strings.

python scripts/analyst.py strings sample.bin --min-len 5

Step 2: Classify by category

Bucket strings into URLs, IPs, domains, file paths, registry keys, mutex/event names, suspicious commands, and API names so leads surface immediately.

Step 3: Prioritize leads

Promote network indicators, command lines, and suspicious API references to the top; defang network artifacts for safe handling.

Step 4: Recognize obfuscation

A near-empty or junk-only dump signals packing/string obfuscation; route to entropy analysis and FLOSS/manual deobfuscation.

Validation

  • Both ASCII and Unicode strings are extracted (Windows wide strings are not missed).
  • Strings are grouped into useful categories, not a flat list.
  • A sparse/garbage dump is correctly read as an obfuscation signal, not "clean".

Pitfalls

  • Extracting ASCII only and missing UTF-16LE strings.
  • Treating a packed sample's empty dump as benign.
  • Reporting live URLs/IPs without defanging.

References

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-pack212026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-pack212026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-pack212026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-pack212026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-pack212026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-pack212026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