Range Scenario · crucible · 35 min
Insider Threat: Behavioral Anomaly Review with AI
This cybersecurity training scenario simulates a working incident. A behavioral cybersecurity model surfaced four users with anomaly scores above 0.85 this month. Read the contributing features, pick the false positives, decide who needs an HR-coordinated review.
Scenario briefing
You are an insider-threat program lead at a 7,500-person defense contractor. The behavioral analytics platform fuses identity, file access, and DLP signals into a per-user anomaly score 0 to 1. The model flagged four users above 0.85 this month: a senior engineer, a DBA, a finance manager, and a junior salesperson.
The model exposes per-user feature trails: late-night access count, distinct hosts touched, DLP egress events, peer-deviation score, and HR-flag (PIP, departure, poor review).
This scenario tests insider-threat tradecraft, the discipline of feature-trail review, and the human-resources coordination that distinguishes a security investigation from a witch hunt. Sources: NIST SP 800-53 PM-12 Insider Threat Program, CERT Insider Threat Center research.
What you will practice
- Read behavioral feature trails without latching onto a single feature
- Distinguish anomaly from malicious behavior
- Coordinate HR involvement before security action
- Pick monitor-vs-investigate vs no-action correctly
How this scenario is scored
The scenario has 6 ordered steps. Most steps are exact-match (a MITRE ATT&CK technique ID, a tool name, or a yes/no decision) or multiple choice. Free-text steps queue for manual review and do not affect the auto-final-score in the MVP.
Each step has a max score of 100 points. Hints deduct points up front, listed before you reveal them. Your final score is the sum across steps. Range Elo updates on completion based on scenario difficulty (Advanced) and your final score percentage.
Frequently asked questions
Why is anomaly not the same as malicious?
Anomaly means deviation from baseline. Most anomaly is benign: new project, role change, late deadline, family emergency, new tool adoption. Malicious anomaly is a small subset. The job of the insider-threat program is to triage anomaly with HR context, not to treat every score-spike as an attack.
When does HR get involved?
HR coordinates anytime the case may affect employment status. Pure anomaly review without HR involvement risks a wrong call that damages a career. Mature programs have a written escalation gate: any tier-2 review with employment implications requires HR-program-counsel partnership before security takes action.
What is the legal context for behavioral monitoring?
Behavioral monitoring sits in employment law and privacy law jurisdictions that vary by region. In the US, employer monitoring of work systems is generally permitted with notice. In the EU, GDPR Article 88 and member-state employment law impose stronger constraints. Programs should pair monitoring with clear acceptable-use notices, employee training, and counsel guidance.
Course content is for educational purposes only and does not constitute professional advice. All claims are supported by cited peer-reviewed academic research. DecipherU does not teach or reproduce any proprietary sales methodology. Verify all referenced sources independently.
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