alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE W32/Virus-Encoder Ransomware Checkin"; flow:established,to_server; http.method; content:"POST"; http.request_body; content:"submit=submit&id="; fast_pattern; content:"&guid="; content:"&pc="; content:"&mail="; http.header_names; content:!"Referer|0d 0a|"; content:!"User-Agent|0d 0a|"; reference:md5,57a69d5130d32da0a278c72137ca58ee; classtype:command-and-control; sid:2022737; rev:4; metadata:attack_target Client_Endpoint, created_at 2016_04_15, deployment Perimeter, confidence High, signature_severity Major, tag Ransomware, updated_at 2020_06_30, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)