Google Cloud Firewall Modified or Deleted

Description

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

Query · sigma

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

Known false positives

  • 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.
Raw source Google Cloud Firewall Modified or Deleted · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified. 
title: Google Cloud Firewall Modified or Deleted
id: fe513c69-734c-4d4a-8548-ac5f609be82b
status: test
description: Detects  when a firewall rule is modified or deleted in Google Cloud Platform (GCP).
references:
    - 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: Austin Songer @austinsonger
date: 2021-08-13
modified: 2022-10-09
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:
    - 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.
level: medium

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