Microsoft 365 - Unusual Volume of File Deletion (via threat_management)

title: Microsoft 365 - Unusual Volume of File Deletion (via threat_management)
id: 901c3df2-629b-5200-bd5f-09b949f39038
status: stable
description: This rule detects when a Microsoft Cloud App Security reported a user has deleted a unusual a large volume of files.
references:
    - https://attack.mitre.org/techniques/T1485/
    - 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: Huntrule Team
date: 2026-07-01
tags:
    - attack.impact
    - attack.t1485
logsource:
    service: threat_management
    product: m365
detection:
    selection:
        eventSource: SecurityComplianceCenter
        eventName: 'Unusual volume of file deletion'
        status: success
    condition: selection
falsepositives:
    - Unknown
level: medium