Google Cloud Kubernetes RoleBinding

title: Google Cloud Kubernetes RoleBinding
id: 0322d9f2-289a-47c2-b5e1-b63c90901a3e
status: test
description: Detects the creation or patching of potential malicious RoleBinding. This includes RoleBindings and ClusterRoleBinding.
references:
    - https://github.com/elastic/detection-rules/pull/1267
    - https://kubernetes.io/docs/reference/kubernetes-api/authorization-resources/cluster-role-v1/#ClusterRole
    - https://cloud.google.com/kubernetes-engine/docs/how-to/role-based-access-control
    - https://kubernetes.io/docs/reference/access-authn-authz/rbac/
    - https://cloud.google.com/kubernetes-engine/docs/how-to/audit-logging
author: Austin Songer @austinsonger
date: 2021-08-09
modified: 2022-10-09
tags:
    - attack.credential-access
logsource:
    product: gcp
    service: gcp.audit
detection:
    selection:
        gcp.audit.method_name:
            - io.k8s.authorization.rbac.v*.clusterrolebindings.create
            - io.k8s.authorization.rbac.v*.rolebindings.create
            - io.k8s.authorization.rbac.v*.clusterrolebindings.patch
            - io.k8s.authorization.rbac.v*.rolebindings.patch
            - io.k8s.authorization.rbac.v*.clusterrolebindings.update
            - io.k8s.authorization.rbac.v*.rolebindings.update
            - io.k8s.authorization.rbac.v*.clusterrolebindings.delete
            - io.k8s.authorization.rbac.v*.rolebindings.delete
    condition: selection
falsepositives:
    - RoleBindings and ClusterRoleBinding being modified or deleted may be performed by a system administrator. Verify whether the user identity, user agent, and/or hostname should be making changes in your environment.
    - RoleBindings and ClusterRoleBinding modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
level: medium