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Kubernetes Suspicious Self-Subject Review via Unusual User Agent

This rule detects when a service account or node attempts to enumerate their own permissions via the selfsubjectaccessreview or selfsubjectrulesreview APIs via an unusual user agent. This is highly unusual behavior…

Description

This rule detects when a service account or node attempts to enumerate their own permissions via the selfsubjectaccessreview or selfsubjectrulesreview APIs via an unusual user agent. This is highly unusual behavior for non-human identities like service accounts and nodes. An adversary may have gained access to credentials/tokens and this could be an attempt to determine what privileges they have to facilitate further movement or execution within the cluster.

Detection logic

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Detection requirements

Platform
ContainersIaaSIdentity ProviderLinuxmacOSOffice SuiteSaaSWindows

The rule states no platform. This is derived from the 2 ATT&CK techniques it maps to.

Log source category
event_index

Known benign triggers

  • An administrator may submit this request as an "impersonatedUser" to determine what privileges a particular service account has been granted. However, an adversary may utilize the same technique as a means to determine the privileges of another token other than that of the compromised account.

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