ET HUNTING Observed Interesting Content-Type Inbound (application/x-sh)

Query · suricata

flow:established,to_client;
http.header;
content:"Content-Type|3a 20|application/x-sh"; fast_pattern;
pcre:"/^(?:\x3b|\r\n)/R";
Raw source ET HUNTING Observed Interesting Content-Type Inbound (application/x-sh) · 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET HUNTING Observed Interesting Content-Type Inbound (application/x-sh)";
    flow:established,to_client;
    http.header;
    content:"Content-Type|3a 20|application/x-sh"; fast_pattern;
    pcre:"/^(?:\x3b|\r\n)/R";
    reference:url,developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/MIME_types/Common_types;
    classtype:policy-violation;
    sid:2031747; rev:3;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2021_03_02, deployment Perimeter, performance_impact Significant, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_15;
)

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