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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.

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See how to install

Files included (4)

  • SKILL.md2.7 KB
  • LICENSE340 B
  • references/api-reference.md1.1 KB
  • scripts/analyst.py3.1 KB

SKILL.md (original)

Review the instructions the agent will receive before you install.

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

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