ET WEB_SERVER China Chopper WebShell Observed Outbound

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"|3c 25 40 20|Page|20|Language=|22|Jscript|22 25 3e 3c 25|eval|28|"; fast_pattern;
content:"FromBase64String"; distance:0; nocase;
content:"|25 3e|"; distance:0;
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:"|3c 25 40 20|Page|20|Language=|22|Jscript|22 25 3e 3c 25|eval|28|"; fast_pattern;
    content:"FromBase64String"; distance:0; nocase;
    content:"|25 3e|"; distance:0;
    classtype:trojan-activity;
    sid:2027393; rev:2;
    metadata:affected_product Web_Server_Applications, attack_target Server, created_at 2019_05_29, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2020_08_31;
)

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