GCP Storage Bucket Permissions Modification

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Identifies when the Identity and Access Management (IAM) permissions are modified for a Google Cloud Platform (GCP) storage bucket. An adversary may modify the permissions on a storage bucket to weaken their target’s security controls or an administrator may inadvertently modify the permissions, which could lead to data exposure or loss.

Rule type: query

Rule indices:

  • filebeat-*
  • logs-gcp*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: None (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Domain: Cloud
  • Data Source: GCP
  • Data Source: Google Cloud Platform
  • Use Case: Identity and Access Audit
  • Tactic: Defense Evasion

Version: 104

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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Rule query

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event.dataset:gcp.audit and event.action:"storage.setIamPermissions" and event.outcome:success

Framework: MITRE ATT&CKTM