ET WEB_SERVER Generic Webshell Observed Outbound

Query · suricata

flow:established,to_client;
http.stat_code;
content:"200";
file.data;
content:"<form action=|22 22 20|";
content:"<input|20|type=|22|text|22 20|name=|22|_jy|22|><input|20|type=|22|submit|22 20|value=|22|>>"; fast_pattern;
Raw source ET WEB_SERVER Generic Webshell Observed Outbound · Suricata
Esc
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 WEB_SERVER Generic Webshell Observed Outbound";
    flow:established,to_client;
    http.stat_code;
    content:"200";
    file.data;
    content:"<form action=|22 22 20|";
    content:"<input|20|type=|22|text|22 20|name=|22|_jy|22|><input|20|type=|22|submit|22 20|value=|22|>>"; fast_pattern;
    classtype:attempted-admin;
    sid:2031651; rev:1;
    metadata:attack_target Web_Server, created_at 2021_02_23, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_02_23;
)

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