alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET EXPLOIT_KIT ErrTraffic Domain in TLS SNI (check .first-node .rocks)"; flow:established,to_server; tls.sni; bsize:22; content:"check.first-node.rocks"; fast_pattern; reference:url,silentpush.com/blog/drivesurge/; classtype:exploit-kit; sid:2069652; rev:1; metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2026_06_04, deployment Perimeter, performance_impact Low, confidence High, signature_severity Minor, tag Exploit_Kit, tag compromised_website, tag Description_Generated_By_Proofpoint_Nexus, tag ErrTraffic, updated_at 2026_06_26, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1189, mitre_technique_name Drive_by_Compromise;)