本文へ移動
cccskills
無料GitHub で公開

hunting-lolbin-abuse-on-windows

Hunts for living-off-the-land binary (LOLBin) abuse in Windows process-creation telemetry by flagging trusted system binaries used with download, execution-proxy, or encoded-command arguments. Activates for requests to hunt LOLBins, detect signed-binary proxy execution, or find suspicious certutil/mshta/regsvr32 usage.

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.md1.1 KB
  • scripts/analyst.py3.1 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。

Hunting LOLBin Abuse on Windows

When to Use

  • You have process-creation telemetry (Sysmon Event ID 1 or EDR process events as CSV/JSON) and want to surface trusted binaries used for malicious proxy execution or download.
  • You are building a detection from known LOLBin argument patterns.

Do not use this as a blocklist of the binaries themselves — they are legitimate. Hunt on the suspicious argument/parent context, not mere presence.

Prerequisites

  • Process-creation events with image path, command line, and (ideally) parent image.

Workflow

Step 1: Score LOLBin invocations

python scripts/analyst.py hunt events.csv

Flags known LOLBins (certutil, mshta, regsvr32, rundll32, bitsadmin, msiexec, installutil, wmic) paired with suspicious arguments (-urlcache, http, javascript:, scrobj, -decode, DownloadString).

Step 2: Add context

Weight by anomalous parent (Office, browser, script host) and unusual execution path.

Step 3: Triage and confirm

Investigate the top-scoring events; confirm whether the download/proxy behavior is legitimate administration or malicious.

Step 4: Operationalize

Convert confirmed patterns into a Sigma rule for ongoing detection.

Validation

  • Flags require a suspicious argument/parent, not just the binary name.
  • Known-benign administrative patterns are distinguishable from abuse in the output.
  • Each flagged technique maps to an ATT&CK ID (T1218.x / T1105).

Pitfalls

  • Alerting on rundll32/regsvr32 presence alone — extremely noisy.
  • Missing renamed LOLBins (hash/signature checks help, name checks do not).
  • Encoded-command obfuscation hiding the true argument intent.

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-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