huntrule

Okta user.session.start via anonymising proxy service

Identifies Okta user session starts where the session is marked as using an anonymizing proxy.

FreeReviewedSigma · High · v4
Product
okta
Service
okta
Author
kelnage (SigmaHQ), DRL 1.1
Published
2023-09-07
Updated
2026-07-31
AnalysisDetection

ATT&CK techniques

  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 identifies Okta events where a user session starts and the security context indicates the user is behind an anonymising proxy service. Attackers may use anonymising infrastructure to obscure the real source and complicate attribution during interactive access. It relies on Okta system log telemetry for user.session.start events and the securityContext.isProxy indicator.

Reporting behind it

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Malicious FIN7 AvNeutralizer EDR Killer Execution via Masqueraded Binary (via process_creation)
Suspicious Process Explorer Kernel Driver Dropped as PED.sys via File Creation (via file_event)
Okta user.session.start via anonymising proxy service
Pivot detection · T1685 · 9 related

Changelog

v4
  1. v4
    Candidate ingested via manual entry.2026-07-31
  2. v3
    Candidate ingested via manual entry.2026-07-31
  3. v2
    Candidate ingested via manual entry.2026-07-31
  4. 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.