Microsoft 365 - User Restricted from Sending Email

Detects when a Security Compliance Center reported a user who exceeded sending limits of the service policies and because of this has been restricted from sending email.

Sigma rule (View on GitHub)

 1title: Microsoft 365 - User Restricted from Sending Email
 2id: ff246f56-7f24-402a-baca-b86540e3925c
 3status: test
 4description: Detects when a Security Compliance Center reported a user who exceeded sending limits of the service policies and because of this has been restricted from sending email.
 5references:
 6    - https://learn.microsoft.com/en-us/defender-cloud-apps/anomaly-detection-policy
 7    - https://learn.microsoft.com/en-us/defender-cloud-apps/policy-template-reference
 8author: austinsonger
 9date: 2021/08/19
10modified: 2022/10/09
11tags:
12    - attack.initial_access
13    - attack.t1199
14logsource:
15    service: threat_management
16    product: m365
17detection:
18    selection:
19        eventSource: SecurityComplianceCenter
20        eventName: 'User restricted from sending email'
21        status: success
22    condition: selection
23falsepositives:
24    - Unknown
25level: medium

References

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