alert http $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET POLICY HTTP traffic on port 443 (HEAD)"; flow:to_server,established; http.method; content:"HEAD"; classtype:bad-unknown; sid:2013927; rev:6; metadata:attack_target Client_Endpoint, tls_state plaintext, created_at 2011_11_18, deployment Perimeter, confidence High, signature_severity Informational, updated_at 2024_03_12;)