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MediumElastic detection rulesElastic

Azure AKS CoreDNS or Kube-DNS Configuration Modified

Detects an identity creating or modifying the CoreDNS or kube-dns ConfigMap in the kube-system namespace on AKS (Azure Kubernetes Service), excluding known AKS control-plane and platform identities. Rewriting cluster…

Description

Detects an identity creating or modifying the CoreDNS or kube-dns ConfigMap in the kube-system namespace on AKS (Azure Kubernetes Service), excluding known AKS control-plane and platform identities. Rewriting cluster DNS (by editing coredns/kube-dns or creating and editing coredns-custom) enables cluster-wide adversary-in-the-middle by redirecting internal service resolution to attacker-controlled IPs, allowing credential capture and traffic interception. Coverage includes workload service accounts (system:serviceaccount:*), so a compromised in-cluster token is not excluded.

Detection logic

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Detection requirements

Platform
LinuxmacOSNetwork DevicesWindows

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

Log source category
event_index

Known benign triggers

  • Approved automation, platform controllers, or GitOps may update the CoreDNS ConfigMap (for example custom forward rules). Validate the identity and change window, and add exclusions for verified service accounts.

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