Sigma rule: Google Cloud Firewall Modified or Deleted

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-2f16be4542f2, updated 2022-10-09T00:00:00.000Z.

Rule

Title
Google Cloud Firewall Modified or Deleted
Status
test
Level
medium
Author
Austin Songer @austinsonger
Date
2021-08-13
Modified
2022-10-09
File
rules/cloud/gcp/audit/gcp_firewall_rule_modified_or_deleted.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects when a firewall rule is modified or deleted in Google Cloud Platform (GCP).

Log source

product
gcp
service
gcp.audit

Detection

selection:
    gcp.audit.method_name:
        - v*.Compute.Firewalls.Delete
        - v*.Compute.Firewalls.Patch
        - v*.Compute.Firewalls.Update
        - v*.Compute.Firewalls.Insert
condition: selection

False positives (as the rule lists them)

  • Firewall rules being modified or deleted may be performed by a system administrator. Verify that the firewall configuration change was expected.
  • Exceptions can be added to this rule to filter expected behavior.

Tags

  • attack.defense-impairment
  • attack.t1685

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/gcp/audit/gcp_firewall_rule_modified_or_deleted.yml

Sources and licences

  • SigmaHQ

    "Google Cloud Firewall Modified or Deleted" by Austin Songer @austinsonger (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/cloud/gcp/audit/gcp_firewall_rule_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: Google Cloud Firewall Modified or Deleted",
entity page, dataset version ref-2f16be4542f2, updated 2022-10-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/fe513c69-734c-4d4a-8548-ac5f609be82b (accessed 2026-11-03).
Underlying source: SigmaHQ rule fe513c69-734c-4d4a-8548-ac5f609be82b, 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.