alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Tactical RMM in TLS SNI (icanhazip .tacticalrmm .io)"; flow:established,to_server; tls.sni; bsize:24; content:"icanhazip.tacticalrmm.io"; fast_pattern; nocase; reference:url,docs.tacticalrmm.com/howitallworks/; classtype:misc-activity; sid:2068549; rev:1; metadata:attack_target Client_and_Server, created_at 2026_04_02, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag RAT, tag RemoteAccessTool, tag RMM, tag TacticalRMM, updated_at 2026_04_03, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1219, mitre_technique_name Remote_Access_Software;)