alert tcp $EXTERNAL_NET 1024: -> $HOME_NET any (msg:"ET MALWARE CobianRAT Receiving Additional Commands From CnC"; flow:from_server,established; content:"|01 00 00 00 FF FF FF FF 01|"; depth:15; content:"more|7c 2d 7c|"; within:30; fast_pattern; pcre:"/^(?:FM|SM|CP|CM|MC|NF|CH|PS|PT)/R"; reference:md5,94911666a61beb59d2988c4fc7003e5a; reference:url,www.zscaler.com/blogs/research/cobian-rat-backdoored-rat; classtype:command-and-control; sid:2024653; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_09_01, deployment Perimeter, malware_family CobianRAT, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2019_07_26;)