alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Malicious Domain (jscloud .ink in TLS SNI)"; flow:established,to_server; tls.sni; bsize:11; content:"jscloud.ink"; fast_pattern; reference:url,securityintelligence.com/posts/x-force-uncovers-global-netscaler-gateway-credential-harvesting-campaign/; classtype:trojan-activity; sid:2048481; rev:2; metadata:attack_target Client_Endpoint, created_at 2023_10_06, deployment Perimeter, deprecation_reason Relevance, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_01_23, reviewed_at 2025_01_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)