ET WEB_SERVER China Chopper WebShell Observed Outbound

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"<%@|20|Page|20|Language=|22|Jscript|22|%><eval|28|Request.Item|5b|"; fast_pattern;
content:"|22 29 3b|%>"; within:50;
Raw source ET WEB_SERVER China Chopper WebShell Observed Outbound · 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 $HTTP_SERVERS any -> $EXTERNAL_NET any (
    msg:"ET WEB_SERVER China Chopper WebShell Observed Outbound";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"<%@|20|Page|20|Language=|22|Jscript|22|%><eval|28|Request.Item|5b|"; fast_pattern;
    content:"|22 29 3b|%>"; within:50;
    classtype:trojan-activity;
    sid:2027341; rev:4;
    metadata:created_at 2019_05_09, performance_impact Low, signature_severity Major, updated_at 2020_11_18;
)

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