ET HUNTING Suspicious Zipped Filename in Outbound POST Request (Bookmarks Firefox.txt) M1

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"PK"; startswith;
content:"Bookmarks|5c|Firefox.txt"; fast_pattern; nocase; distance:0;
Raw source ET HUNTING Suspicious Zipped Filename in Outbound POST Request (Bookmarks Firefox.txt) M1 · Suricata
Esc
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 (Bookmarks Firefox.txt) M1";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"PK"; startswith;
    content:"Bookmarks|5c|Firefox.txt"; fast_pattern; nocase; distance:0;
    reference:md5,8a5761a2d8a5730e5f6edaf558781897;
    classtype:trojan-activity;
    sid:2039111; rev:1;
    metadata:attack_target Client_Endpoint, created_at 2022_10_06, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Stealer, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_06;
)

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