huntrule

Azure Entra suspicious browser risk events across multiple tenants and countries

Flags Azure suspicious browser risk events tied to anomalous sign-ins across tenants and countries from the same browser.

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

Initial Access → Defense Evasion

  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 risk events of type suspiciousBrowser in Azure Entra risk detection. It is intended to surface anomalous sign-in behavior where activity appears to span multiple tenants and originates from different countries within the same browser, which attackers may leverage to evade detection while reusing client context. Telemetry relies on risk detection events reporting riskEventType='suspiciousBrowser'.

Reporting behind it

Related detections9 linkedT1078 — drag to rearrange
Suspicious SonicWall NetExtender VPN Command-Line Authentication with Always-Trust (via process_creation)
Suspicious Self-Hosted GitHub Actions Runner Started As Root via Shell (via process_creation)
Suspicious Login Shell Assigned to Service Account games on Linux
Suspicious SSH Daemon Configuration Change Enabling Root Login
Suspicious NTLM Network Logon From Attacker Controlled Workstation Names (via security)
Suspicious dMSA Object Access with Migration AccessMask
Malicious ESX Admins Group Added to Privileged Directory Group
Malicious ESX Admins Group Creation via WinRM Host
Suspicious BrightMetricAgent Remote Tool Execution Associated With Volt Typhoon
Azure Entra suspicious browser risk events across multiple tenants and countries
Pivot detection · T1078 · 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.