ET INFO Potential Common Malicious JavaScript Loop

Query · suricata

flow:established,to_client;
content:"for(";
content:"|3B|"; within:20;
content:">=0|3B|"; fast_pattern; within:10;
content:"--)"; within:10;
pcre:"/for\x28[^\x3D\r\n]*[0-9]{1,6}\x2D[0-9]{1,5}\x3B[^\x3D\r\n]\x3E\x3D0\x3B[^\x29\r\n]\x2D\x2D\x29/";
Raw source ET INFO Potential Common Malicious JavaScript Loop · 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 INFO Potential Common Malicious JavaScript Loop";
    flow:established,to_client;
    content:"for(";
    content:"|3B|"; within:20;
    content:">=0|3B|"; fast_pattern; within:10;
    content:"--)"; within:10;
    pcre:"/for\x28[^\x3D\r\n]*[0-9]{1,6}\x2D[0-9]{1,5}\x3B[^\x3D\r\n]\x3E\x3D0\x3B[^\x29\r\n]\x2D\x2D\x29/";
    classtype:bad-unknown;
    sid:2015045; rev:5;
    metadata:created_at 2012_07_07, performance_impact Significant, confidence High, signature_severity Informational, updated_at 2024_04_08;
)

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