Suspicious OAuth App File Download Activities

Detects when a Microsoft Cloud App Security reported when an app downloads multiple files from Microsoft SharePoint or Microsoft OneDrive in a manner that is unusual for the user.

Sigma rule (View on GitHub)

 1title: Suspicious OAuth App File Download Activities
 2id: ee111937-1fe7-40f0-962a-0eb44d57d174
 3status: test
 4description: Detects when a Microsoft Cloud App Security reported when an app downloads multiple files from Microsoft SharePoint or Microsoft OneDrive in a manner that is unusual for the user.
 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: Austin Songer @austinsonger
 9date: 2021/08/23
10modified: 2022/10/09
11tags:
12    - attack.exfiltration
13logsource:
14    service: threat_management
15    product: m365
16detection:
17    selection:
18        eventSource: SecurityComplianceCenter
19        eventName: 'Suspicious OAuth app file download activities'
20        status: success
21    condition: selection
22falsepositives:
23    - Unknown
24level: medium

References

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