ET HUNTING Missing Content-Type in Multipart/Form-Data Request

Query · suricata

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;
Raw source ET HUNTING Missing Content-Type in Multipart/Form-Data Request · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
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;
)

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