huntrule

Azure Entra ID anomalous user activity risk event

Alerts on Azure AD risk events indicating anomalous user activity via riskEventType=anomalousUserActivity.

FreeReviewedSigma · High · v5
Product
azure
Service
riskdetection
Author
Mark Morowczynski '@markmorow', Gloria Lee, '@gleeiamglo' (SigmaHQ), DRL 1.1
Published
2023-09-03
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

Persistence → Priv Esc

  1. Recon

  2. Resource Dev

  3. Initial Access

  4. Execution

  5. Persistence

  6. Priv Esc

  7. Defense Evasion

  8. Cred Access

  9. Discovery

  10. Lateral Movement

  11. Collection

  12. C2

  13. Exfiltration

  14. Impact

What it detects

This rule flags Azure Entra ID Risk Detection events where riskEventType is anomalousUserActivity. Attackers may trigger this by performing unusual actions that alter account or directory state patterns. The detection relies on the riskdetection telemetry emitted by the risk event source, specifically matching riskEventType.

Reporting behind it

Related detections9 linkedT1098 — drag to rearrange
Malicious Cluster-Admin Role Binding Creation (via audit)
Malicious User Password Change Using Current Hash Password - ChangeNTLM - Mimikatz (via security)
Suspicious Account Password Set to Never Expire. (via security)
Malicious Modification of a Computer Account SPN (via security)
Suspicious Massive Group Membership Changes (via security)
Malicious High Risk Active Directory Group Membership Change (via security)
Malicious Account Marked as Sensitive and Cannot Be Delegated Had Its Protection Removed (via security)
Malicious Host Constrained Delegation Settings Changed for Potential Abuse (Rubeus) - Kerberos Only (via security)
Malicious Host Set with Unconstrained Delegation (via security)
Azure Entra ID anomalous user activity risk event
Pivot detection · T1098 · 9 related

Changelog

v5
  1. v5
    Candidate ingested via manual entry.2026-07-31
  2. v4
    Candidate ingested via manual entry.2026-07-31
  3. v3
    Candidate ingested via manual entry.2026-07-31
  4. v2
    Candidate ingested via manual entry.2026-07-31
  5. v1
    No changelog recorded for this version.2026-07-30

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.