The detection rule titled 'Kubernetes NodePort Service Deployed' is designed to identify any newly created services within Kubernetes clusters that utilize the NodePort service type. A NodePort service opens a designated port on each node in the cluster, allowing access to a specific set of pods which could pose a significant security risk by exposing applications directly to the internet. The main concern is that such configurations can facilitate bypassing of conventional network security measures and might lead to the interception of sensitive traffic. The rule is particularly relevant for environments running on managed Kubernetes services like AWS EKS, Azure AKS, and GCP GKE, monitoring their respective audit logs for certain create events related to NodePort services. It provides a structured runbook to assess the legitimacy of such deployments through user activity analysis, service specifications inspection, and reviewing the exposure of critical application ports.