alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Malicious Domain (meowware .ddns .net in TLS SNI)"; flow:established,to_server; tls.sni; bsize:17; content:"meowware.ddns.net"; fast_pattern; reference:md5,342432ebc4caf520ba541c96916af5fa; classtype:trojan-activity; sid:2057808; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_11_25, deployment Perimeter, deprecation_reason Age, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_05_14, reviewed_at 2025_05_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)