GCP Break-glass Container Workload Deployed — Sigma Rule

Rule metadata and linked tags

Author: Bryan Lim. Source status: test; severity: medium. Source dates: 2024-01-12 / not supplied.

{
  "product": "gcp",
  "service": "gcp.audit"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 20b11e75958761bba7ae8f5849b8689e00fc9b2c4d7c15927aa173dc9af27f27

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: GCP Break-glass Container Workload Deployed
id: 76737c19-66ee-4c07-b65a-a03301d1573d
status: test
description: |
    Detects the deployment of workloads that are deployed by using the break-glass flag to override Binary Authorization controls.
references:
    - https://cloud.google.com/binary-authorization
author: Bryan Lim
date: 2024-01-12
tags:
    - attack.privilege-escalation
    - attack.t1548
logsource:
    product: gcp
    service: gcp.audit
detection:
    selection:
        data.protoPayload.resource.type: 'k8s_cluster'
        data.protoPayload.logName:
            - 'cloudaudit.googleapis.com/activity'
            - 'cloudaudit.googleapis.com%2Factivity'
        data.protoPayload.methodName: 'io.k8s.core.v1.pods.create'
    keywords:
        - 'image-policy.k8s.io/break-glass'
    condition: selection and keywords
falsepositives:
    - Unknown
level: medium

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://cloud.google.com/binary-authorization