alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE UAC-006 Domain in TLS SNI (ukr-net-download-files-php-name .ru)"; flow:established,to_server; tls.sni; bsize:34; content:"ukr-net-download-files-php-name.ru"; fast_pattern; reference:url,cert.gov.ua/article/6032734; classtype:trojan-activity; sid:2048492; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_10_06, deployment Perimeter, deprecation_reason Age, performance_impact Low, confidence High, signature_severity Major, tag UAC_006, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_19, reviewed_at 2024_03_19, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)