alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET HUNTING Kubernetes Ingress NGINX Controller Annotation Injection"; flow:established,to_server; http.method; content:"POST"; http.content_type; content:"application/json"; http.request_body; content:"|22|admission.k8s.io/v1|22 2c|"; content:"|22|nginx.ingress.kubernetes.io/"; fast_pattern; pcre:"/^[a-z-]+\x22\x3a\s*?\x22[^\x22]*?(?:\x23|\x3b\x7d)/R"; classtype:web-application-attack; sid:2061122; rev:1; metadata:affected_product Kubernetes, attack_target Server, tls_state TLSDecrypt, created_at 2025_03_27, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Exploit, updated_at 2025_03_27, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)