alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING Missing Content-Type in Multipart/Form-Data Request"; flow:established,to_server; http.method; content:"POST"; http.header_names; content:!"|0d 0a |Content-Type|0d 0a|"; nocase; http.header; content:!"Content-Type|3a 20|multipart/form-data|3b|"; nocase; http.request_body; content:"Content-Disposition|3a 20|form-data|3b|"; fast_pattern; classtype:bad-unknown; sid:2055521; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_08_26, deployment Perimeter, performance_impact Low, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_08_26, reviewed_at 2025_08_26;)