GCP Storage Bucket Permissions Modification

Synopsis

Field	Value
Activation Period	14 Days
Training Period	30 Days
Test Period	N/A (single event)
Deduplication Period	3 Hours
Required Data	Gcp Audit Log
Detection Modules	Cloud
Detector Tags	Cloud Data Asset Disaster Recovery Risks, Cloud Data Asset Configuration, Data Detection & Response
ATT&CK Tactic	Defense Impairment (TA0112)
ATT&CK Technique	File and Directory Permissions Modification (T1222)
Severity	Informational

Description

A GCP storage bucket's IAM permissions were modified. An attacker might use this technique to expose sensitive data or cause data loss.

Attacker's Goals

Exfiltrate information.

Investigative actions

• Check which data exists in the modified bucket and its classification.
• Look for events that involve actions for the bucket data.