alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Free Hosting Domain (my-board .org) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".my-board.org"; endswith; fast_pattern; reference:url,byet.host/free-hosting; classtype:misc-activity; sid:2066986; rev:2; metadata:affected_product Any, attack_target Client_and_Server, created_at 2026_01_22, deployment Perimeter, deprecation_reason Duplicate, performance_impact Low, confidence High, signature_severity Informational, updated_at 2026_01_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1102, mitre_technique_name Web_Service;)