ET WEB_SERVER WebShell - Generic - c99shell based POST structure

Query · suricata

flow:established,to_server;
content:"|0d 0a 0d 0a|act="; fast_pattern;
http.method;
content:"POST";
http.request_body;
content:"act="; depth:4;
content:"&d="; within:20;
Raw source ET WEB_SERVER WebShell - Generic - c99shell based POST structure · 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 WEB_SERVER WebShell - Generic - c99shell based POST structure";
    flow:established,to_server;
    content:"|0d 0a 0d 0a|act="; fast_pattern;
    http.method;
    content:"POST";
    http.request_body;
    content:"act="; depth:4;
    content:"&d="; within:20;
    classtype:attempted-user;
    sid:2016516; rev:3;
    metadata:created_at 2013_03_04, confidence Medium, signature_severity Major, updated_at 2020_04_23;
)

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