ET WEB_CLIENT Great Cannon DDoS JS M1

Query · suricata

flow:established,to_client;
http.stat_code;
content:"200";
file.data;
content:"eval|28|function|28|p,a,c,k,e,r|29|"; depth:26;
content:"|20|TASKID|3d|"; distance:0;
content:"|20|MAGICNUM|3d|"; within:25;
content:"|20|EXECNUM|3d|"; within:25;
content:"|20|FEEDBACKADDR|3d|"; within:25;
content:"|28 2f|chrome|5c 5c 2f 28 5b 5c 5c 64 5d 2b 29 2f|gi"; distance:0; fast_pattern;
Raw source ET WEB_CLIENT Great Cannon DDoS JS 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_CLIENT Great Cannon DDoS JS M1";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    file.data;
    content:"eval|28|function|28|p,a,c,k,e,r|29|"; depth:26;
    content:"|20|TASKID|3d|"; distance:0;
    content:"|20|MAGICNUM|3d|"; within:25;
    content:"|20|EXECNUM|3d|"; within:25;
    content:"|20|FEEDBACKADDR|3d|"; within:25;
    content:"|28 2f|chrome|5c 5c 2f 28 5b 5c 5c 64 5d 2b 29 2f|gi"; distance:0; fast_pattern;
    reference:url,citizenlab.ca/2015/04/chinas-great-cannon/;
    reference:url,twitter.com/chrisdoman/status/1168576334777454594;
    classtype:attempted-dos;
    sid:2027961; rev:4;
    metadata:affected_product Web_Browsers, attack_target Client_Endpoint, created_at 2019_09_06, deployment Perimeter, confidence High, signature_severity Minor, updated_at 2020_11_19;
)

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