alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed CobaltStrike CnC Related Domain in TLS SNI"; flow:established,to_server; tls.sni; bsize:24; content:"query.newdata-update.com"; fast_pattern; nocase; classtype:command-and-control; sid:2072083; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSEncrypt, created_at 2026_09_17, deployment Perimeter, malware_family Cobalt_Strike, performance_impact Low, confidence High, signature_severity Critical, updated_at 2026_09_17;)