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Elastic Docs ›Elastic Security Solution [8.16] ›Detections and alerts ›Prebuilt rule reference

Microsoft 365 Exchange Anti-Phish Policy Deletion

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Microsoft 365 Exchange Anti-Phish Policy Deletion

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Identifies the deletion of an anti-phishing policy in Microsoft 365. By default, Microsoft 365 includes built-in features that help protect users from phishing attacks. Anti-phishing polices increase this protection by refining settings to better detect and prevent attacks.

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): 7.11.0

Last modified (Elastic Stack release): 8.6.0

Rule authors: Elastic

Rule license: Elastic License v2

Potential false positives

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An anti-phishing policy may be deleted by a system or network administrator. Verify that the configuration change was expected. Exceptions can be added to this rule to filter expected behavior.

Investigation guide

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Rule query
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event.dataset:o365.audit and event.provider:Exchange and
event.category:web and event.action:"Remove-AntiPhishPolicy" and
event.outcome:success











Threat mapping
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Framework: MITRE ATT&CKTM














Rule version history
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Version 101 (8.6.0 release)








    

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Version 100 (8.5.0 release)








    

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Version 7 (8.4.0 release)








    

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Version 5 (8.1.0 release)








    

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Version 4 (7.13.0 release)








    

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Version 3 (7.12.0 release)








    

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Version 2 (7.11.2 release)








    

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