Azure Diagnostic Settings Deletion

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Identifies the deletion of diagnostic settings in Azure, which send platform logs and metrics to different destinations. An adversary may delete diagnostic settings in an attempt to evade defenses.

Rule type: query

Rule indices:

  • filebeat-*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-25m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Elastic
  • Cloud
  • Azure
  • Continuous Monitoring
  • SecOps
  • Monitoring

Version: 1

Added (Elastic Stack release): 7.10.0

Rule authors: Elastic

Rule license: Elastic License

Potential false positives

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Deletion of diagnostic settings may be done by a system or network administrator. Verify whether the username, hostname, and/or resource name should be making changes in your environment. Diagnostic settings deletion from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guide

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The Azure Filebeat module must be enabled to use this rule.

Rule query

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event.dataset:azure.activitylogs and azure.activitylogs.operation_name
:MICROSOFT.INSIGHTS/DIAGNOSTICSETTINGS/DELETE and
event.outcome:Success

Threat mapping

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Framework: MITRE ATT&CKTM