Microsoft 365 - Potential Ransomware Activity

Detects when a Microsoft Cloud App Security reported when a user uploads files to the cloud that might be infected with ransomware.

Sigma rule (View on GitHub)

 1title: Microsoft 365 - Potential Ransomware Activity
 2id: bd132164-884a-48f1-aa2d-c6d646b04c69
 3status: test
 4description: Detects when a Microsoft Cloud App Security reported when a user uploads files to the cloud that might be infected with ransomware.
 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.impact
13    - attack.t1486
14logsource:
15    service: threat_management
16    product: m365
17detection:
18    selection:
19        eventSource: SecurityComplianceCenter
20        eventName: 'Potential ransomware activity'
21        status: success
22    condition: selection
23falsepositives:
24    - Unknown
25level: medium

References

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