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GCP Access Policy Deleted

Detects when an access policy that is applied to a GCP cloud resource is deleted. An adversary would be able to remove access policies to gain access to a GCP cloud resource.

MITRE ATT&CK

T1098

persistenceprivilege-escalation

Detection Query

selection:
  data.protoPayload.authorizationInfo.permission:
    - accesscontextmanager.accessPolicies.delete
    - accesscontextmanager.accessPolicies.accessLevels.delete
    - accesscontextmanager.accessPolicies.accessZones.delete
    - accesscontextmanager.accessPolicies.authorizedOrgsDescs.delete
  data.protoPayload.authorizationInfo.granted: "true"
  data.protoPayload.serviceName: accesscontextmanager.googleapis.com
condition: selection

Author

Bryan Lim

Created

2024-01-12

Data Sources

gcpgcp.audit

Platforms

gcp

References

Tags

attack.persistenceattack.privilege-escalationattack.t1098

Raw Content

title: GCP Access Policy Deleted
id: 32438676-1dba-4ac7-bf69-b86cba995e05
status: test
description: |
    Detects when an access policy that is applied to a GCP cloud resource is deleted.
    An adversary would be able to remove access policies to gain access to a GCP cloud resource.
references:
    - https://cloud.google.com/access-context-manager/docs/audit-logging
    - https://cloud.google.com/logging/docs/audit/understanding-audit-logs
    - https://cloud.google.com/logging/docs/reference/audit/auditlog/rest/Shared.Types/AuditLog
author: Bryan Lim
date: 2024-01-12
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.t1098
logsource:
    product: gcp
    service: gcp.audit
detection:
    selection:
        data.protoPayload.authorizationInfo.permission:
            - 'accesscontextmanager.accessPolicies.delete'
            - 'accesscontextmanager.accessPolicies.accessLevels.delete'
            - 'accesscontextmanager.accessPolicies.accessZones.delete'
            - 'accesscontextmanager.accessPolicies.authorizedOrgsDescs.delete'
        data.protoPayload.authorizationInfo.granted: 'true'
        data.protoPayload.serviceName: 'accesscontextmanager.googleapis.com'
    condition: selection
falsepositives:
    - Legitimate administrative activities
level: medium