RBAC Permission Enumeration Attempt — Sigma Rule

Rule metadata and linked tags

Author: Leo Tsaousis (@laripping). Source status: test; severity: low. Source dates: 2024-03-26 / not supplied.

{
  "category": "application",
  "product": "kubernetes",
  "service": "audit"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: ae1b5e896a966aeb3368613ef6c5cd5d178a09b494e600f169ca9edb6fe9b733

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: RBAC Permission Enumeration Attempt
id: 84b777bd-c946-4d17-aa2e-c39f5a454325
status: test
description: |
    Detects identities attempting to enumerate their Kubernetes RBAC permissions.
    In the early stages of a breach, attackers will aim to list the permissions they have within the compromised environment.
    In a Kubernetes cluster, this can be achieved by interacting with the API server, and querying the SelfSubjectAccessReview API via e.g. a "kubectl auth can-i --list" command.
    This will enumerate the Role-Based Access Controls (RBAC) rules defining the compromised user's authorization.
references:
    - https://www.elastic.co/guide/en/security/current/kubernetes-suspicious-self-subject-review.html
author: Leo Tsaousis (@laripping)
date: 2024-03-26
tags:
    - attack.t1069.003
    - attack.t1087.004
    - attack.discovery
logsource:
    category: application
    product: kubernetes
    service: audit
detection:
    selection:
        verb: 'create'
        apiGroup: 'authorization.k8s.io'
        objectRef.resource: 'selfsubjectrulesreviews'
    condition: selection
falsepositives:
    - Unknown
level: low

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://www.elastic.co/guide/en/security/current/kubernetes-suspicious-self-subject-review.html