alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE [PTsecurity] Donut Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; http.header; content:"Expect|3a 20|100-continue|0d 0a|"; http.request_body; content:"pc_id="; depth:6; content:"pc_key="; distance:0; content:"win_ver="; fast_pattern; distance:0; http.content_type; content:"application/x-www-form-urlencoded"; endswith; http.header_names; content:!"Referer"; content:!"User-Agent"; content:!"Accept"; content:!"Cache"; classtype:command-and-control; sid:2025595; rev:4; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2018_06_19, deployment Perimeter, malware_family Donut, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_16, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)