Threat hunting searches for hidden attacker activity that evades alerts, helping limit dwell time and damage through evidence-led detection.
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Background for this topic.
Threat hunting is the proactive search for signs of compromise that automated alerts, signatures, or routine monitoring may miss. Analysts form hypotheses from threat intelligence and observed attacker tactics, techniques, and procedures, then examine endpoint, identity, network, cloud, and application telemetry for unusual behavior. The work may uncover unauthorized persistence, credential use, or lateral movement before an attacker’s objective is reached.
In a threat model, hunting addresses adversaries who already have—or may have obtained—an initial foothold and are deliberately avoiding detection. Its value depends on usable, time-synchronized logs, adequate visibility, and disciplined investigation rather than isolated anomalies. Effective practice prioritizes high-risk assets and attack paths, tests hypotheses against historical data, turns validated findings into detections, and preserves evidence for containment and scoping. Access to detailed user and system data should also be limited and governed because hunting can expose sensitive information.
Microsoft is working to mitigate an ongoing incident that has been blocking access to some Defender XDR portal capabilities for the past 10 hours. [...]