Azure Kubernetes Events Deleted — Sigma Rule

Rule metadata and linked tags

Author: Austin Songer @austinsonger. Source status: test; severity: medium. Source dates: 2021-07-24 / 2022-08-23.

{
  "product": "azure",
  "service": "activitylogs"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: affe27cadbf40a66421f7346511f23aec03258ff8732218b7beb7d580f093476

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: Azure Kubernetes Events Deleted
id: 225d8b09-e714-479c-a0e4-55e6f29adf35
status: test
description: Detects when Events are deleted in Azure Kubernetes. An adversary may delete events in Azure Kubernetes in an attempt to evade detection.
references:
    - https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#microsoftkubernetes
    - https://github.com/elastic/detection-rules/blob/da3852b681cf1a33898b1535892eab1f3a76177a/rules/integrations/azure/defense_evasion_kubernetes_events_deleted.toml
author: Austin Songer @austinsonger
date: 2021-07-24
modified: 2022-08-23
tags:
    - attack.defense-impairment
    - attack.t1685
logsource:
    product: azure
    service: activitylogs
detection:
    selection:
        operationName: MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/EVENTS.K8S.IO/EVENTS/DELETE
    condition: selection
falsepositives:
    - Event deletions may be done by a system or network administrator. Verify whether the username, hostname, and/or resource name should be making changes in your environment. Events deletions from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.
level: medium

Original YAML and metadata in JSON

False positives

• Event deletions may be done by a system or network administrator. Verify whether the username, hostname, and/or resource name should be making changes in your environment. Events deletions from unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Source references

• https://learn.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#microsoftkubernetes
• https://github.com/elastic/detection-rules/blob/da3852b681cf1a33898b1535892eab1f3a76177a/rules/integrations/azure/defense_evasion_kubernetes_events_deleted.toml