Possible Public Bucket IAM Binding for Data Exfiltration (via gcp)
- Product
- gcp
- Service
- gcp.audit
- Author
- HuntRule
- Published
- 2026-10-18
- Updated
- 2026-10-18
ATT&CK techniques
Defense Evasion → CollectionRecon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
Exfiltration
Impact
What it detects
This rule detects GCP IAM policy changes that grant the allAuthenticatedUsers or allUsers principals object-creator access on storage buckets, exposing them to universal write. Attackers abuse this global-namespace binding to hijack buckets and stage cloud data exfiltration.
Reporting behind it
Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.
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