alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed BlueMoon EK CnC Related Domain in TLS SNI"; flow:established,to_server; tls.sni; bsize:17; content:"data.curtis11.com"; fast_pattern; nocase; classtype:command-and-control; sid:2072079; rev:1; metadata:tls_state TLSEncrypt, created_at 2026_09_17, deployment Perimeter, malware_family BlueMoonEK, performance_impact Low, confidence High, signature_severity Critical, tag compromised_website, updated_at 2026_09_17; target:src_ip;)