alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA398 Domain in TLS SNI (intelupates .com)"; flow:established,to_server; tls.sni; dotprefix; content:".intelupates.com"; endswith; fast_pattern; classtype:domain-c2; sid:2065611; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2025_10_30, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag TA398, tag Description_Generated_By_Proofpoint_Nexus, tag CurlBack_RAT, updated_at 2025_10_30, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol_DNS;)