alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed ZLoader CnC Domain in SNI"; flow:to_server,established; tls.sni; content:"yuidskadjna.com"; endswith; classtype:domain-c2; sid:2033422; rev:2; metadata:attack_target Client_Endpoint, created_at 2021_07_26, deployment Perimeter, confidence High, signature_severity Major, tag SSL_TLS_SNI, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_07_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)