ET HUNTING Suspicious Zipped Filename in Outbound POST Request (google_chrome_default_) M1

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"PK"; depth:2;
content:"google_chrome_default_"; distance:26; within:100; nocase; fast_pattern;
pcre:"/^(?:logins|c(?:cdata|ookie))/Ri";
Raw source ET HUNTING Suspicious Zipped Filename in Outbound POST Request (google_chrome_default_) M1 · 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 (google_chrome_default_) M1";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"PK"; depth:2;
    content:"google_chrome_default_"; distance:26; within:100; nocase; fast_pattern;
    pcre:"/^(?:logins|c(?:cdata|ookie))/Ri";
    classtype:trojan-activity;
    sid:2027276; rev:3;
    metadata:attack_target Client_and_Server, created_at 2019_04_24, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag T1002, tag data_compressed, updated_at 2020_08_28;
)

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