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Microsoft 365 Unusual Volume of File Deletion

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Microsoft 365 Unusual Volume of File Deletion

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Identifies that a user has deleted an unusually large volume of files as reported by Microsoft Cloud App Security.

Rule type: query

Rule indices:

filebeat-*
logs-o365*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-30m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

Elastic
Cloud
Microsoft 365
Continuous Monitoring
SecOps
Configuration Audit

Version: 101 (version history)

Added (Elastic Stack release): 7.16.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positives

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Users or System Administrator cleaning out folders.

Investigation guide

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Rule query

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event.dataset:o365.audit and event.provider:SecurityComplianceCenter
and event.category:web and event.action:"Unusual volume of file
deletion" and event.outcome:success