alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Gamaredon Domain (plutoniumo .ru in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".plutoniumo.ru"; endswith; fast_pattern; reference:md5,66486dbb4a01b9c48761498db2e13579; reference:url,twitter.com/DmitriyMelikov/status/1742855526864564426; classtype:trojan-activity; sid:2049910; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_01_04, deployment Perimeter, confidence High, signature_severity Major, tag Gamaredon, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_01_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)