alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TryNodeRAT CnC Domain in TLS SNI (okx3 .io)"; flow:established,to_server; tls.sni; dotprefix; content:".okx3.io"; endswith; fast_pattern; classtype:domain-c2; sid:2072316; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2026_10_01, deployment Perimeter, malware_family TryNodeRAT, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag c2, updated_at 2026_10_01;)