alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Comodo ITarian RMM-related Domain (one .comodo .com) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".one.comodo.com"; endswith; fast_pattern; reference:url,help.itarian.com/topic-459-1-1005-14776-Appendix-1b---Endpoint-Manager-Services---IP-Nos,-Host-Names-and-Port-Details---US-Customers.html; reference:url,help.itarian.com/topic-459-1-1005-14775-Appendix-1a---Endpoint-Manager-Services---IP-Nos,-Host-Names-and-Port-Details---EU-Customers.html?af=7639; classtype:misc-activity; sid:2064015; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Mac_OSX, affected_product Linux, attack_target Client_and_Server, created_at 2025_08_15, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag RMM, tag Remote_Access, tag Comodo_ITarian, updated_at 2025_08_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1219, mitre_technique_name Remote_Access_Software;)