alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed LegionLoader Domain in TLS SNI (legions .win)"; flow:established,to_server; tls.sni; content:"legions.win"; bsize:11; fast_pattern; classtype:trojan-activity; sid:2046297; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_06_16, deployment Perimeter, malware_family LegionLoader, performance_impact Low, confidence High, signature_severity Major, tag SSL_Malicious_Cert, updated_at 2023_06_16, reviewed_at 2025_07_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)