IMPORTANT: No additional bug fixes or documentation updates will be released for this version. For the latest information, see the current release documentation.

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Azure Kubernetes Events Deleted

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Azure Kubernetes Events Deleted

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Identifies when events are deleted in Azure Kubernetes. Kubernetes events are objects that log any state changes. Example events are a container creation, an image pull, or a pod scheduling on a node. An adversary may delete events in Azure Kubernetes in an attempt to evade detection.

Rule type: query

Rule indices:

filebeat-*
logs-azure*

Severity: medium

Risk score: 47

Runs every: 5 minutes

Searches indices from: now-25m (Date Math format, see also Additional look-back time)

Maximum alerts per execution: 100

References:

https://docs.microsoft.com/en-us/azure/role-based-access-control/resource-provider-operations#microsoftkubernetes

Tags:

Elastic
Cloud
Azure
Continuous Monitoring
SecOps
Log Auditing

Version: 100 (version history)

Added (Elastic Stack release): 7.16.0

Last modified (Elastic Stack release): 8.5.0

Rule authors: Austin Songer

Rule license: Elastic License v2

Potential false positives

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Events 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 by unfamiliar users or hosts should be investigated. If known behavior is causing false positives, it can be exempted from the rule.

Investigation guide

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Rule query

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event.dataset:azure.activitylogs and azure.activitylogs.operation_name
:"MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/EVENTS.K8S.IO/EVENTS/DELETE"
and event.outcome:(Success or success)

Threat mapping

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Framework: MITRE ATT&CK^TM

Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
Technique:
- Name: Impair Defenses
- ID: T1562
- Reference URL: https://attack.mitre.org/techniques/T1562/

Rule version history

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Version 100 (8.5.0 release)

Formatting only

Version 6 (8.4.0 release)

Updated query, changed from:

event.dataset:azure.activitylogs and azure.activitylogs.operation_name
:"MICROSOFT.KUBERNETES/CONNECTEDCLUSTERS/EVENTS.K8S.IO/EVENTS/DELETE"
and event.outcome:(Success or success)

Version 4 (8.2.0 release)

Formatting only

Version 3 (8.1.0 release)

Formatting only

Version 2 (8.0.0 release)

Formatting only

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