title: Google Cloud Storage Buckets Enumeration
id: e2feb918-4e77-4608-9697-990a1aaf74c3
description: Detects when storage bucket is enumerated in Google Cloud.
author: Austin Songer @austinsonger
status: experimental
date: 2021/08/14
references:
    - https://cloud.google.com/storage/docs/json_api/v1/buckets
logsource:
  product: gcp
  service: gcp.audit
detection:
    selection:
        gcp.audit.method_name: 
            - storage.buckets.list
            - storage.buckets.listChannels
    condition: selection
level: low
tags:
    - attack.discovery
falsepositives:
 - Storage Buckets being enumerated may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment. 
 - Storage Buckets enumerated from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.