alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Remcos RAT Checkin 27"; flow:established,to_server; content:"|bf 9b b2 d8 b7 a9 86 78 26 d6 10|"; depth:11; fast_pattern; content:"|0e 24|"; distance:2; within:2; threshold:type limit, seconds 30, count 1, track by_src; reference:md5,5c52234cf35ab8d08b10fcc3c2a9d32b; reference:url,blog.talosintelligence.com/2018/08/picking-apart-remcos.html; classtype:command-and-control; sid:2026017; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_08_23, deployment Perimeter, malware_family Remcos, performance_impact Low, confidence High, signature_severity Major, tag RAT, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_06, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)