alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Filecoder.OJC CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/ap.php"; endswith; http.header_names; content:!"Referer"; http.request_body; content:"user|3d|"; startswith; content:"TargetID|3d|"; pcre:"/^[A-F0-9]{24}/R"; content:"SystemInformation|3d|Windows%20"; fast_pattern; content:"max_size_of_file|3d|"; content:"size_of_hdd|3d|"; reference:md5,dea5df7e709f087f2c1d03046f38efe7; classtype:trojan-activity; sid:2039815; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_and_Server, created_at 2022_11_21, deployment Perimeter, malware_family Win32_Filecoder_OJC, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_21, reviewed_at 2025_07_14;)