alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/CryptFile2 / Revenge Ransomware Checkin M3"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"id="; depth:3; content:"&count="; distance:0; fast_pattern; pcre:"/^id=[0-9A-Z]+&count=/"; http.header_names; content:!"Referer|0d 0a|"; content:!"User-Agent|0d 0a|"; reference:md5,116fbce554b25829b17b6e47990821b4; classtype:command-and-control; sid:2024056; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_03_15, deployment Perimeter, malware_family CryptFile2, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_04, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)