ET HUNTING Dropbox Hosted PDF with an Encoded Filename

Query · suricata

flow:established,to_client;
http.stat_code;
content:"200";
http.header;
content:"content-disposition|3a 20|attachment|3b 20|filename=|22|"; nocase;
content:"filename*"; distance:0;
content:"x-dropbox"; fast_pattern;
http.response_body;
content:"|25 50 44 46 2D|";
Raw source ET HUNTING Dropbox Hosted PDF with an Encoded Filename · Suricata
Esc
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 Dropbox Hosted PDF with an Encoded Filename";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    http.header;
    content:"content-disposition|3a 20|attachment|3b 20|filename=|22|"; nocase;
    content:"filename*"; distance:0;
    content:"x-dropbox"; fast_pattern;
    http.response_body;
    content:"|25 50 44 46 2D|";
    reference:url,developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Headers/Content-Disposition;
    classtype:misc-activity;
    sid:2068229; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2026_03_13, deployment Perimeter, performance_impact Moderate, confidence High, signature_severity Informational, updated_at 2026_03_16;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.