alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Remcos RAT Checkin 23"; flow:established,to_server; content:"|1b 84 d5 b0 5d f4 c4 93 c5 30 c2|"; depth:11; fast_pattern; content:"|da b1|"; distance:2; within:2; threshold:type limit, seconds 30, count 1, track by_src; reference:md5,f4f2425e9735f92cc9f75711aa8cb210; classtype:command-and-control; sid:2025637; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_07_03, deployment Perimeter, malware_family Remcos, confidence High, signature_severity Major, tag RAT, updated_at 2020_11_06;)