alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Observed NGC2180/DFKRAT CnC Domain (windowscer .shop) in TLS SNI"; flow:established,to_server; tls.sni; bsize:15; content:"windowscer.shop"; fast_pattern; reference:url,rt-solar.ru/solar-4rays/blog/4124/; classtype:trojan-activity; sid:2051522; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2024_03_07, deployment Perimeter, deployment SSLDecrypt, former_category MALWARE, malware_family NGC2180, malware_family DFKRAT, performance_impact Low, confidence High, signature_severity Major, tag NGC2180, tag DFKRAT, updated_at 2025_07_14, reviewed_at 2025_07_14; target:src_ip;)