Azure Firewall Policy Deletionedit

Identifies the deletion of a firewall policy in Azure. An adversary may delete a firewall policy in an attempt to evade defenses and/or to eliminate barriers in carrying out their initiative.

Rule type: query

Rule indices:

  • filebeat-*
  • logs-azure*

Severity: low

Risk score: 21

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
  • Network Security

Version: 3 (version history)

Added (Elastic Stack release): 7.10.0

Last modified (Elastic Stack release): 7.11.2

Rule authors: Elastic

Rule license: Elastic License

Potential false positivesedit

Firewall policy deletions 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. Firewall policy deletions from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guideedit

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

Rule queryedit

event.dataset:azure.activitylogs and azure.activitylogs.operation_name
:MICROSOFT.NETWORK/FIREWALLPOLICIES/DELETE and event.outcome:(Success
or success)

Threat mappingedit

Framework: MITRE ATT&CKTM

Rule version historyedit

Version 3 (7.11.2 release)
  • Formatting only
Version 2 (7.11.0 release)
  • Updated query, changed from:

    event.dataset:azure.activitylogs and azure.activitylogs.operation_name
    :MICROSOFT.NETWORK/FIREWALLPOLICIES/DELETE and event.outcome:Success