This rule detects when a service account makes an unauthorized request for resources from the API server. Service accounts follow a very predictable pattern of behavior. A service account should never send an unauthorized request to the API server. This behavior is likely an indicator of compromise or of a problem within the cluster. An adversary may have gained access to credentials/tokens and this could be an attempt to access or create resources to facilitate further movement or execution within the cluster.
Rule type: query
Risk score: 47
Runs every: 5 minutes
Maximum alerts per execution: 100
- Continuous Monitoring
Added (Elastic Stack release): 8.5.0
Rule authors: Elastic
Rule license: Elastic License v2
Unauthorized requests from service accounts are highly abnormal and more indicative of human behavior or a serious problem within the cluster. This behavior should be investigated further.
event.dataset: "kubernetes.audit_logs" and kubernetes.audit.user.username: system\:serviceaccount\:* and kubernetes.audit.annotations.authorization_k8s_io/decision: "forbid"