alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Gamaredon Domain (procellarumbi .ru in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".procellarumbi.ru"; endswith; fast_pattern; reference:url,twitter.com/Cyber0verload/status/1678151014459879432; reference:url,twitter.com/Cyber0verload/status/1678150909694443520; classtype:domain-c2; sid:2046778; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_07_10, deployment Perimeter, confidence High, signature_severity Major, tag Gamaredon, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_07_10, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)