ET EXPLOIT Possible WebShell JPEG Upload

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.request_body;
content:"|FF D8 FF E0|"; depth:4;
content:"JFIF"; distance:2; within:4;
content:"<%eval|20|request|28 22|"; distance:0; fast_pattern;
Raw source ET EXPLOIT Possible WebShell JPEG Upload · 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 EXPLOIT Possible WebShell JPEG Upload";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"|FF D8 FF E0|"; depth:4;
    content:"JFIF"; distance:2; within:4;
    content:"<%eval|20|request|28 22|"; distance:0; fast_pattern;
    classtype:attempted-admin;
    sid:2027737; rev:2;
    metadata:attack_target Web_Server, created_at 2019_07_22, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag WebShell, updated_at 2020_08_31;
)

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