Sigma rule: Azure Firewall Rule Collection Modified or Deleted

Rule

Title

Azure Firewall Rule Collection Modified or Deleted

Status

test

Level

medium

Author

Austin Songer @austinsonger

Date

2021-08-08

Modified

2022-08-23

File

rules/cloud/azure/activity_logs/azure_firewall_rule_collection_modified_or_deleted.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Identifies when Rule Collections (Application, NAT, and Network) is being modified or deleted.

Log source

product

azure

service

activitylogs

Detection

selection:
    operationName:
        - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/WRITE
        - MICROSOFT.NETWORK/AZUREFIREWALLS/APPLICATIONRULECOLLECTIONS/DELETE
        - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/WRITE
        - MICROSOFT.NETWORK/AZUREFIREWALLS/NATRULECOLLECTIONS/DELETE
        - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/WRITE
        - MICROSOFT.NETWORK/AZUREFIREWALLS/NETWORKRULECOLLECTIONS/DELETE
condition: selection

False positives (as the rule lists them)

• Rule Collections (Application, NAT, and Network) being modified or deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
• Rule Collections (Application, NAT, and Network) modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Tags

• attack.impact
• attack.defense-impairment
• attack.t1686.001

MITRE ATT&CK ids this rule names

• T1686.001

References

• https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/activity_logs/azure_firewall_rule_collection_modified_or_deleted.yml