IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.
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Elastic Docs ›Elastic Security Solution [8.9] ›Detections and alerts ›Prebuilt rule reference

Kubernetes Denied Service Account Request

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Kubernetes Denied Service Account Request

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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

Rule indices:

  • logs-kubernetes.*

Severity: medium

Risk score: 47

Runs every: 5m

Searches indices from: None (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

Tags:

  • Data Source: Kubernetes
  • Tactic: Discovery

Version: 5

Rule authors:

  • Elastic

Rule license: Elastic License v2

Investigation guide

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Setup

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The Kubernetes Fleet integration with Audit Logs enabled or similarly structured data is required to be compatible with this rule.

Rule query

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event.dataset: "kubernetes.audit_logs"
  and kubernetes.audit.user.username: system\:serviceaccount\:*
  and kubernetes.audit.annotations.authorization_k8s_io/decision: "forbid"

Framework: MITRE ATT&CKTM

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