alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE ZPHP CnC Domain in TLS SNI (psk777 .casa)"; flow:established,to_server; tls.sni; bsize:11; content:"psk777.casa"; fast_pattern; reference:url,www.proofpoint.com/us/blog/threat-insight/are-you-sure-your-browser-date-current-landscape-fake-browser-updates; classtype:domain-c2; sid:2053414; rev:1; metadata:created_at 2024_06_10, performance_impact Low, confidence High, signature_severity Critical, tag compromised_website, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_06_10, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)