ET MALWARE China Chopper Command Struct

Query · suricata

flow:to_server,established;
content:"FromBase64String"; fast_pattern;
content:"unsafe"; distance:0;
content:"eval(";
http.method;
content:"POST"; nocase;
http.request_body;
content:"&z";
pcre:"/^\d{1,3}=/Ri";
Raw source ET MALWARE China Chopper Command Struct · 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 -> $HTTP_SERVERS any (
    msg:"ET MALWARE China Chopper Command Struct";
    flow:to_server,established;
    content:"FromBase64String"; fast_pattern;
    content:"unsafe"; distance:0;
    content:"eval(";
    http.method;
    content:"POST"; nocase;
    http.request_body;
    content:"&z";
    pcre:"/^\d{1,3}=/Ri";
    reference:url,www.fireeye.com/blog/technical/botnet-activities-research/2013/08/breaking-down-the-china-chopper-web-shell-part-i.html;
    classtype:trojan-activity;
    sid:2017313; rev:5;
    metadata:created_at 2013_08_12, signature_severity Major, updated_at 2020_11_03;
)

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