{"id":"6c220477-0b5b-4b25-bb90-66183b4089e8","title":"Suspicious Inbox Forwarding","description":"Detects when a Microsoft Cloud App Security reported suspicious email forwarding rules, for example, if a user created an inbox rule that forwards a copy of all emails to an external address.","author":"Austin Songer @austinsonger","status":"test","level":"low","date":"2021-08-22","modified":"2022-10-09","tags":["attack.exfiltration","attack.t1020"],"technique_ids":["T1020"],"logsource":{"service":"threat_management","product":"m365"},"falsepositives":["Unknown"],"references":["https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy","https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference"],"source_path":"rules/cloud/m365/threat_management/microsoft365_susp_inbox_forwarding.yml","source_sha256":"896c0db274f2702806403d8688f3d8da72f7e4aab3f8b853cc8c5a991a14a655","source_url":"https://github.com/anpa1200/sigma/blob/b249e9683190cffdcaf188ccbfb90bf4759844e1/rules/cloud/m365/threat_management/microsoft365_susp_inbox_forwarding.yml","license":"Detection Rule License 1.1","license_url":"https://github.com/SigmaHQ/Detection-Rule-License/blob/main/LICENSE.Detection.Rules.md","yaml":"title: Suspicious Inbox Forwarding\nid: 6c220477-0b5b-4b25-bb90-66183b4089e8\nstatus: test\ndescription: Detects when a Microsoft Cloud App Security reported suspicious email forwarding rules, for example, if a user created an inbox rule that forwards a copy of all emails to an external address.\nreferences:\n    - https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy\n    - https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference\nauthor: Austin Songer @austinsonger\ndate: 2021-08-22\nmodified: 2022-10-09\ntags:\n    - attack.exfiltration\n    - attack.t1020\nlogsource:\n    service: threat_management\n    product: m365\ndetection:\n    selection:\n        eventSource: SecurityComplianceCenter\n        eventName: 'Suspicious inbox forwarding'\n        status: success\n    condition: selection\nfalsepositives:\n    - Unknown\nlevel: low\n","validation":"yaml_parsed_not_backend_compiled_or_live_validated","techniques":[{"key":"enterprise/T1020","id":"T1020","name":"Automated Exfiltration","page":"techniques/enterprise/T1020/"}],"data_path":"data/detection-rules/6c220477-0b5b-4b25-bb90-66183b4089e8.json","kind":"sigma"}