Case study: Using YARA rules and LLM triage to scan 114k OSS artifacts
cyb3rops · x · 2026-08-20
The post describes a security solution combining generic YARA rules with LLM triage to detect malicious software packages.
Case: Two generic YARA rules flagged the malicious proc-macro1 package. It was sent to LLM triage, which recognized the anomaly and escalated it to an analyst.
System Architecture (Funnel Model):
- Scan: 114,000 new OSS artifacts scanned daily.
- Rule Filter: Cheap, deterministic YARA rules filter the stream, identifying 4,600 targets daily.
- LLM Triage: Only rule-flagged artifacts undergo LLM semantic analysis ($3/day). The LLM resolves 4,500 simple cases.
- Analyst Review: Only 100 artifacts require human review.
This approach ensures efficient large-scale supply chain security while minimizing costs.
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