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Detection rules › Sigma

Azure Kubernetes Events Deleted

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

Detects when Events are deleted in Azure Kubernetes. An adversary may delete events in Azure Kubernetes in an attempt to evade detection.

MITRE ATT&CK coverage

TacticTechniques
Defense ImpairmentT1685 Disable or Modify Tools

Event coverage

ProviderEvent
Azure-Microsoft.KubernetesMicrosoft.Kubernetes/connectedClusters/events.k8s.io/events/delete

Rule body yaml

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    operationName: MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/EVENTS.K8S.IO/EVENTS/DELETE

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
operationNameeq
  • MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/EVENTS.K8S.IO/EVENTS/DELETE