alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed NoMachine Network RMM Domain (nomachine .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".nomachine.com"; endswith; fast_pattern; reference:url,www.nomachine.com/network/go-to-network; classtype:misc-activity; sid:2068934; rev:1; metadata:affected_product Any, attack_target Client_and_Server, created_at 2026_04_22, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag RMM_SOFTWARE, updated_at 2026_04_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1219, mitre_technique_name Remote_Access_Software;)