Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed BlackSanta Domain (thresumebuilder .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".thresumebuilder.com"; endswith; fast_pattern; classtype:trojan-activity; sid:2067845; rev:1; metadata:attack_target Client_Endpoint, created_at 2026_02_19, deployment Perimeter, malware_family BlackSanta, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_02_19;)