Suspicious Google Cloud Firewall Modified or Deleted (via gcp.audit)

title: Suspicious Google Cloud Firewall Modified or Deleted (via gcp.audit)
id: 51bf1def-12f1-5b8b-b280-8548593e19ba
status: stable
description: This rule detects when a firewall rule is modified or deleted in Google Cloud Platform (GCP).
references:
    - https://attack.mitre.org/techniques/T1685/
    - https://cloud.google.com/kubernetes-engine/docs/how-to/audit-logging
    - https://developers.google.com/resources/api-libraries/documentation/compute/v1/java/latest/com/google/api/services/compute/Compute.Firewalls.html
author: Huntrule Team
date: 2026-02-18
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    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
falsepositives:
    - Unknown
level: medium