Insider Threats and Agent Behavior Analytics (ABA)
Insider threats and agent behavior analytics (ABA)
This domain combines insider-risk investigation with agent behavior analytics. In this context, an agent is any identity or automated actor that acts on systems and data, including employees, contractors, privileged administrators, service accounts, scripts, and endpoint agents. The exam tests whether you can distinguish risky behavior from malicious behavior using context, peer baselines, and evidence.
Core rules and concepts
- Insider risk is about authorized access used abnormally, not just external intrusion. Look for access after resignation or notice, mass downloads, staging, unusual hours, personal cloud use, privilege abuse, and attempts to bypass monitoring.
- ABA extends UEBA to non-human and privileged agents. A service account, backup job, or automation agent should be modeled by its normal hosts, commands, destinations, and schedule. Deviations matter more when the agent has broad access.
- Context is decisive: HR status, change tickets, manager approval, project assignments, legal hold, and data classification. An anomaly without context is only a lead.
- Use least privilege and separation of duties as investigative evidence. Excessive entitlements increase impact and should raise severity.
- Handle privacy and legal requirements. Collect only what the investigation needs, restrict access to case data, and involve HR or legal when employee monitoring or disciplinary action is possible.
Worked example
A sales operations employee downloads 4,000 files from a shared drive at 23:00, then uploads a compressed archive to a personal cloud account. Reasoning: check peer behavior for the role, whether the files are normally accessible, whether a project or migration ticket exists, and whether the user has given notice or changed roles. If the user is on a performance plan, the files include customer contracts, and the destination is unapproved, escalate as suspected insider data exfiltration. Preserve access logs, disable the personal-cloud path, and coordinate with HR and legal before interviewing. If a approved migration explains the volume and destination, document the exception and tune the rule.
Traps
- Equating anomaly with malice; insiders can trigger false positives through legitimate projects.
- Ignoring non-human agents, which often have excessive access and weak oversight.
- Responding without HR or legal coordination in employee cases.
- Monitoring beyond the investigation scope and creating privacy or evidence problems.