alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Myth Stealer Related Domain (mythstealer .win) in TLS SNI"; flow:established,to_server; tls.sni; dotprefix; content:".mythstealer.win"; endswith; fast_pattern; reference:url,www.trellix.com/blogs/research/demystifying-myth-stealer-a-rust-based-infostealer/; reference:url,www.reddit.com/r/cybersecurity/comments/1lndppc/i_was_infected_by_a_trojan_from_combatshellcom/; reference:url,tria.ge/250629-dkj41sfj6x/behavioral1; reference:md5,4a0998be49a361908a5adaf8d0665a41; classtype:domain-c2; sid:2063257; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2025_07_01, deployment Perimeter, malware_family MythStealer, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_07_01, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1566, mitre_technique_name Phishing;)