alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Malicious Domain in TLS SNI (hijackson .org)"; flow:established,to_server; tls.sni; dotprefix; content:".hijackson.org"; endswith; fast_pattern; reference:md5,3061050ea5532508e71b7ab663549ff4; classtype:trojan-activity; sid:2049432; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_12_01, deployment Perimeter, confidence High, signature_severity Major, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_04, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)