ET MALWARE Possible Outbound WebShell GIF

Query · suricata

flow:established,from_server;
http.stat_code;
content:"200";
file.data;
content:"GIF89a"; depth:6;
content:"<%eval|20|request|28 22|"; distance:0; fast_pattern;
Raw source ET MALWARE Possible Outbound WebShell GIF · 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 MALWARE Possible Outbound WebShell GIF";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"GIF89a"; depth:6;
    content:"<%eval|20|request|28 22|"; distance:0; fast_pattern;
    classtype:trojan-activity;
    sid:2027738; rev:3;
    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_09_14;
)

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