alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE TA471 Malicious AutoIT File Upload"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/upld/"; startswith; http.content_type; content:"multipart/form-data|3b| boundary=----WebKitFormBoundary"; startswith; http.user_agent; content:"Mozilla/4.0 (compatible|3b 20|Win32|3b 20|WinHttp.WinHttpRequest.5)"; bsize:57; fast_pattern; http.header_names; content:!"Referer"; content:"|0d 0a|Connection|0d 0a|"; depth:14; content:!"Accept-Enc"; reference:md5,75d6f57cfba0ebc3633a49a8412a43e5; reference:md5,304d1ac0296fedec694a097480b341d9; classtype:trojan-activity; sid:2032886; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_04_28, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_28;)