Kubernetes Denied Service Account Request
editKubernetes Denied Service Account Request
editThis 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
Rule indices:
- logs-kubernetes.*
Severity: medium
Risk score: 47
Runs every: 5 minutes
Searches indices from: now-6m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Elastic
- Kubernetes
- Continuous Monitoring
- Discovery
Version: 1
Added (Elastic Stack release): 8.5.0
Rule authors: Elastic
Rule license: Elastic License v2
Potential false positives
editUnauthorized 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.
Investigation guide
editRule query
editevent.dataset: "kubernetes.audit_logs" and kubernetes.audit.user.username: system\:serviceaccount\:* and kubernetes.audit.annotations.authorization_k8s_io/decision: "forbid"
Threat mapping
editFramework: MITRE ATT&CKTM
-
Tactic:
- Name: Discovery
- ID: TA0007
- Reference URL: https://attack.mitre.org/tactics/TA0007/
-
Technique:
- Name: Container and Resource Discovery
- ID: T1613
- Reference URL: https://attack.mitre.org/techniques/T1613/