alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MRCR1 Ransomware Checkin M2"; flow:to_server,established; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"|43 50 55 20 4d 6f 64 65 6c 3a|"; fast_pattern; content:"|43 50 55 20 43 6f 75 6e 74 3a|"; content:"|47 65 74 52 41 4d 3a|"; content:"|5b 53 79 73 74 65 6d 20 50 72 6f 63 65 73 73 5d|"; content:"|5b 50 72 6f 67 72 61 6d 6d 73 5d|"; reference:md5,fc57a660e24d9c91cb5464b2ece30756; reference:md5,a1d83e290429477f05c0eaddafdb0355; classtype:command-and-control; sid:2023692; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_01_03, deployment Perimeter, malware_family Ransomware, confidence High, signature_severity Major, tag Ransomware, updated_at 2020_08_03, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)