Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Earth Krahang APT Domain (happy .gitweb .cloudns .nz in TLS SNI)"; flow:established,to_server; tls.sni; bsize:23; content:"happy.gitweb.cloudns.nz"; fast_pattern; reference:url,www.trendmicro.com/en_us/research/24/c/earth-krahang.html; classtype:trojan-activity; sid:2051859; rev:1; metadata:attack_target Client_Endpoint, created_at 2024_03_28, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_28, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)