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Microsoft 365 User Restricted from Sending Emailedit

Identifies when a user has been restricted from sending email due to exceeding sending limits of the service policies per the Security Compliance Center.

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: 1

Added (Elastic Stack release): 7.16.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positivesedit

A user sending emails using personal distribution folders may trigger the event.

Investigation guideedit

## Config

The Microsoft 365 Fleet integration, Filebeat module, or similarly structured data is required to be compatible with this rule.

Rule queryedit

event.dataset:o365.audit and event.provider:SecurityComplianceCenter
and event.category:web and event.action:"User restricted from sending
email" and event.outcome:success

Threat mappingedit

Framework: MITRE ATT&CKTM

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