alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Observed TrollAgent Domain (ai .kostin .p-e .kr in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".ai.kostin.p-e.kr"; endswith; fast_pattern; reference:url,twitter.com/asdasd13asbz/status/1744279858778456325; reference:url,twitter.com/jaydinbas/status/1744288770524918119; classtype:trojan-activity; sid:2049971; rev:3; metadata:attack_target Client_Endpoint, created_at 2024_01_10, deployment Perimeter, former_category MALWARE, malware_family TrollAgent, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_10_15, reviewed_at 2024_10_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)