Azure Firewall Policy Deletion

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 to their objective.

Rule type: query

Rule indices:

filebeat-*
logs-azure*

Severity: low

Risk score: 21

Runs every: 5m

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

Maximum alerts per execution: 100

References:

https://docs.microsoft.com/en-us/azure/firewall-manager/policy-overview

Tags:

Domain: Cloud
Data Source: Azure
Use Case: Network Security Monitoring
Tactic: Defense Evasion

Version: 102

Rule authors:

Elastic

Rule license: Elastic License v2

Investigation guide

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Setup

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

Rule query

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

Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/
Sub-technique:
- Name: Disable or Modify Tools
- ID: T1562.001
- Reference URL: https://attack.mitre.org/techniques/T1562/001/

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