alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SteamStealer Domain in SNI"; flow:established,to_server; tls.sni; content:"steamdesktopauthenticator.com"; bsize:29; fast_pattern; reference:url,bartblaze.blogspot.co.uk/2018/02/fake-steam-desktop-authenticator-steals.html; classtype:trojan-activity; sid:2025387; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_02_26, deployment Perimeter, malware_family Steam_Stealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_13;)