alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/BlackCarat Response from CnC"; flow:established,from_server; dsize:13; content:"|72 50 bf 9e|"; offset:9; depth:4; fast_pattern; reference:md5,514AB639CD556CEBD78107B4A68A202A; reference:url,www.virusbulletin.com/uploads/pdf/conference_slides/2018/AncelKuprins-VB2018-WolfSheep.pdf; classtype:command-and-control; sid:2026524; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_10_18, deployment Perimeter, malware_family CaratRAT, performance_impact Low, confidence High, signature_severity Major, tag RAT, updated_at 2019_07_26;)