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Detection rules › Sigma

Google Cloud Kubernetes Secrets Modified or Deleted

Status
test
Severity
medium
Log source
product gcp, service gcp.audit
Author
Austin Songer @austinsonger
Source
github.com/SigmaHQ/sigma

Identifies when the Secrets are Modified or Deleted.

Known false positives

  • Secrets 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.
  • Secrets modified or deleted from unfamiliar users should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

MITRE ATT&CK coverage

TacticTechniques
Credential AccessNo specific technique

Telemetry coverage

PlatformRecord / event type
Kubernetescreate-secrets: create secrets
Kubernetesupdate-secrets: update secrets
Kubernetespatch-secrets: patch secrets
Kubernetesdelete-secrets: delete secrets

Rules detecting the same action

These rules filter on the same operation.

Rule body

title: Google Cloud Kubernetes Secrets Modified or Deleted
id: 2f0bae2d-bf20-4465-be86-1311addebaa3
status: test
description: Identifies when the Secrets are Modified or Deleted.
references:
    - 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.core.v*.secrets.create
            - io.k8s.core.v*.secrets.update
            - io.k8s.core.v*.secrets.patch
            - io.k8s.core.v*.secrets.delete
    condition: selection
falsepositives:
    - Secrets 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.
    - Secrets 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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    gcp.audit.method_name:
        - io.k8s.core.v*.secrets.create
        - io.k8s.core.v*.secrets.update
        - io.k8s.core.v*.secrets.patch
        - io.k8s.core.v*.secrets.delete

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
gcp.audit.method_namewildcard
  • io.k8s.core.v*.secrets.create
  • io.k8s.core.v*.secrets.delete
  • io.k8s.core.v*.secrets.patch
  • io.k8s.core.v*.secrets.update
field:"gcp::method_name" kind:wildcard