ET WEB_SERVER WebShell - Generic - GIF Header With HTML Form

Query · suricata

flow:established,to_client;
file_data;
content:"GIF89a"; within:6;
content:"<form "; nocase; fast_pattern; within:150;
content:!"_VIEWSTATE";
Raw source ET WEB_SERVER WebShell - Generic - GIF Header With HTML Form · 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 $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET WEB_SERVER WebShell - Generic - GIF Header With HTML Form";
    flow:established,to_client;
    file_data;
    content:"GIF89a"; within:6;
    content:"<form "; nocase; fast_pattern; within:150;
    content:!"_VIEWSTATE";
    classtype:trojan-activity;
    sid:2017134; rev:5;
    metadata:created_at 2013_07_12, confidence Medium, signature_severity Major, updated_at 2019_07_26;
)

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