ET HUNTING Suspicious Zipped Filename in Outbound POST Request (Cookies/Firefox_)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"PK|03 04|";
content:"Cookies/Firefox_"; nocase; distance:0; fast_pattern;
content:".default.txt"; within:25;
Raw source ET HUNTING Suspicious Zipped Filename in Outbound POST Request (Cookies/Firefox_) · 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 Suspicious Zipped Filename in Outbound POST Request (Cookies/Firefox_)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"PK|03 04|";
    content:"Cookies/Firefox_"; nocase; distance:0; fast_pattern;
    content:".default.txt"; within:25;
    classtype:bad-unknown;
    sid:2033887; rev:1;
    metadata:affected_product Any, attack_target Client_Endpoint, created_at 2021_09_02, deployment Perimeter, confidence Medium, signature_severity Minor, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_02;
)

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