Suspicious Inbox Forwarding

Title: Suspicious Inbox Forwarding
Status: test
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.
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
Author: Austin Songer @austinsonger
Date: 2021-08-22
modified:2022-10-09
Tags:

• -'attack.exfiltration'
• -'attack.t1020'

Logsource:

• service: threat_management
• product: m365

Detection:
  selection:
    eventSource: 'SecurityComplianceCenter'
    eventName: 'Suspicious inbox forwarding'
    status: 'success'
  condition:selection
Falsepositives:
  -Unknown
Level: low