alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Unk.DPRK MalDoc SysInfo CnC Exfil"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name=|22|MAX_FILE_SIZE|22 0d 0a|"; content:"name=|22|userfile|22 3b 20|filename=|22|yo|22 0d 0a|"; distance:0; fast_pattern; http.header_names; content:!"Referer"; content:!"User-Agent"; content:!"Accept"; reference:md5,8a7686430d9ad2832e8a4c3992186b36; classtype:trojan-activity; sid:2033331; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_07_15, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_15;)