alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed TA444 Domain (cloud .mufg .uk in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".cloud.mufg.uk"; endswith; fast_pattern; classtype:trojan-activity; sid:2038852; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_09_15, deployment Perimeter, malware_family TA444, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_09_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)