seikaikyo/detecting-living-off-the-land-with-lolbas
external/anthropic-cybersecurity-skills/skills/detecting-living-off-the-land-with-lolbas/SKILL.md
Detect Living Off the Land Binaries (LOLBins/LOLBAS) abuse including certutil, regsvr32, mshta, and rundll32 via process telemetry, Sigma rules, and parent-child process analysis with Sysmon endpoint data. Use when hunting for adversaries abusing built-in Windows binaries to download, execute, or proxy malicious code while evading traditional executable-based detection.
$ install --global
skillsauthnpx skillsauth add seikaikyo/dash-skills detecting-living-off-the-land-with-lolbasInstall this skill globally with one command. Works with Claude Code, Cursor, and Windsurf.
Security Scan Results
3 of 9 scanners reported clean
Some scanners were skipped, did not run, or reported a non-clean status. Review each row below.
3
Scanners Passed
9
Scanners in report
Clean
TrivyContainer and dependency vulnerability scanner
95%
Clean
SemgrepStatic code analysis for vulnerabilities
95%
Clean
mcp-scan (Snyk)Model Context Protocol security validation
95%
Skipped
Snyk (dep)Open source security scanning
50%
Skipped
Socket.devSupply chain security analysis
50%
Skipped
VirusTotalMulti-engine malware detection
50%
Skipped
CrowdStrikeAdvanced threat intelligence
50%
Skipped
OSV-ScannerOpen Source Vulnerability database check
50%
Skipped
OWASP Dep-Check
50%
Last scanned: Aug 10, 2026, 2:32 AM137.7s1 file scanned
SKILL.md
- name:
- detecting-living-off-the-land-with-lolbas
- description:
- Detect Living Off the Land Binaries (LOLBins/LOLBAS) abuse including
- domain:
- cybersecurity
- subdomain:
- threat-detection
- version:
- 1.0
- author:
- mahipal
- license:
- Apache-2.0
Detecting Living Off the Land with LOLBAS
Overview
Living Off the Land Binaries, Scripts, and Libraries (LOLBAS) are legitimate system utilities abused by attackers to execute malicious actions while evading detection. This skill covers detecting abuse of certutil.exe, regsvr32.exe, mshta.exe, rundll32.exe, msbuild.exe, and other LOLBins using process telemetry from Sysmon and Windows Event Logs, combined with Sigma rule-based detection.
When to Use
- When investigating security incidents that require detecting living off the land with lolbas
- When building detection rules or threat hunting queries for this domain
- When SOC analysts need structured procedures for this analysis type
- When validating security monitoring coverage for related attack techniques
Prerequisites
- Sysmon or Windows Security Event Log (Event ID 4688) with command-line logging enabled
- Sigma rule conversion tool (sigmac or sigma-cli)
- SIEM platform (Splunk, Elastic, or similar) for log ingestion
- Python 3.8+ with pySigma library
- LOLBAS project reference database
Steps
- Establish LOLBin Watchlist — Build a prioritized list of monitored binaries (certutil, mshta, regsvr32, rundll32, msbuild, installutil, cmstp, wmic, bitsadmin)
- Collect Process Telemetry — Ingest Sysmon Event ID 1 (Process Create) and Windows 4688 events with full command-line capture
- Build Sigma Detection Rules — Create Sigma rules matching suspicious command-line arguments, network activity, and parent-child process anomalies for each LOLBin
- Analyze Parent-Child Relationships — Flag unexpected parent processes spawning LOLBins (e.g., Excel spawning certutil, Word spawning mshta)
- Score and Prioritize Alerts — Apply risk scoring based on argument anomaly, parent process, execution path, and network indicators
- Generate Detection Report — Produce a structured report of all LOLBin abuse detections with MITRE ATT&CK mapping
Expected Output
- JSON report listing detected LOLBin abuse events with severity scores
- MITRE ATT&CK technique mapping for each detection (T1218, T1105, T1140, T1127)
- Parent-child process anomaly analysis
- Sigma rule match details with raw event data
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