{"id":"bde30855-5c53-4c18-ae90-1ff79ebc9578","title":"Okta User Session Start Via An Anonymising Proxy Service","description":"Detects when an Okta user session starts where the user is behind an anonymising proxy service.","author":"kelnage","status":"test","level":"high","date":"2023-09-07","modified":"2026-04-27","tags":["attack.defense-impairment","attack.t1685"],"technique_ids":["T1685"],"logsource":{"product":"okta","service":"okta"},"falsepositives":["If a user requires an anonymising proxy due to valid justifications."],"references":["https://developer.okta.com/docs/reference/api/system-log/","https://sec.okta.com/articles/2023/08/cross-tenant-impersonation-prevention-and-detection"],"source_path":"rules/identity/okta/okta_user_session_start_via_anonymised_proxy.yml","source_sha256":"a89e6a11460fcb2a023ff79bd7d9729282c7b1f5543b05f35d063c658e0ec6be","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/identity/okta/okta_user_session_start_via_anonymised_proxy.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Okta User Session Start Via An Anonymising Proxy Service\nid: bde30855-5c53-4c18-ae90-1ff79ebc9578\nstatus: test\ndescription: Detects when an Okta user session starts where the user is behind an anonymising proxy service.\nreferences:\n    - https://developer.okta.com/docs/reference/api/system-log/\n    - https://sec.okta.com/articles/2023/08/cross-tenant-impersonation-prevention-and-detection\nauthor: kelnage\ndate: 2023-09-07\nmodified: 2026-04-27\ntags:\n    - attack.defense-impairment\n    - attack.t1685\nlogsource:\n    product: okta\n    service: okta\ndetection:\n    selection:\n        eventType: 'user.session.start'\n        securityContext.isProxy: 'true'\n    condition: selection\nfalsepositives:\n    - If a user requires an anonymising proxy due to valid justifications.\nlevel: high\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1685","id":"T1685","name":"Disable or Modify Tools","page":"techniques/enterprise/T1685/"}],"data_path":"data/detection-rules/bde30855-5c53-4c18-ae90-1ff79ebc9578.json","kind":"sigma"}