Sigma rule: Azure Network Firewall Policy Modified or Deleted

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-e27acff2abe3, updated 2022-08-23T00:00:00.000Z.

Rule

Title
Azure Network Firewall Policy Modified or Deleted
Status
test
Level
medium
Author
Austin Songer @austinsonger
Date
2021-09-02
Modified
2022-08-23
File
rules/cloud/azure/activity_logs/azure_network_firewall_policy_modified_or_deleted.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Identifies when a Firewall Policy is Modified or Deleted.

Log source

product
azure
service
activitylogs

Detection

selection:
    operationName:
        - MICROSOFT.NETWORK/FIREWALLPOLICIES/WRITE
        - MICROSOFT.NETWORK/FIREWALLPOLICIES/JOIN/ACTION
        - MICROSOFT.NETWORK/FIREWALLPOLICIES/CERTIFICATES/ACTION
        - MICROSOFT.NETWORK/FIREWALLPOLICIES/DELETE
condition: selection

False positives (as the rule lists them)

  • Firewall Policy 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.
  • Firewall Policy 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

References

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_network_firewall_policy_modified_or_deleted.yml

Sources and licences

  • SigmaHQ

    "Azure Network Firewall Policy Modified or Deleted" by Austin Songer @austinsonger (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/azure/activity_logs/azure_network_firewall_policy_modified_or_deleted.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Azure Network Firewall Policy Modified or Deleted",
entity page, dataset version ref-e27acff2abe3, updated 2022-08-23T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/83c17918-746e-4bd9-920b-8e098bf88c23 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 83c17918-746e-4bd9-920b-8e098bf88c23, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.