alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Xehook Stealer Domain (nc1337 .online) in TLS SNI"; flow:established,to_server; tls.sni; bsize:13; content:"nc1337.online"; fast_pattern; reference:url,twitter.com/spamhaus/status/1762799827300008300; reference:md5,1c3c3d869eb0804b24ed9bb2fdd8f3f6; classtype:trojan-activity; sid:2051463; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2024_03_04, deployment Perimeter, malware_family Xehook, performance_impact Low, confidence High, signature_severity Major, updated_at 2024_03_04, reviewed_at 2025_07_14;)