alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT Keitaro TDS Domain in TLS SNI (privatephotos .online)"; flow:established,to_server; tls.sni; bsize:20; content:"privatephotos.online"; fast_pattern; classtype:domain-c2; sid:2063363; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_07_08, deployment Perimeter, confidence High, signature_severity Minor, tag Keitaro_TDS, tag Description_Generated_By_Proofpoint_Nexus, tag Keitaro, updated_at 2025_07_08, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;)