ET WEB_SERVER Generic Webshell Accessed on Internal Server

Query · suricata

flow:established,to_client;
file.data;
content:"<form method=post style=|22|font-family:fantasy|3b 22|>";
content:"Password: <input type=password name=pass style=|22|background-color|3a|whitesmoke|3b|border|3a|1px solid #FFF|3b 22|><input type=submit value='>>' style=|22|border|3a|none|3b|background-color|3a|"; nocase; distance:0; fast_pattern;
Raw source ET WEB_SERVER Generic Webshell Accessed on Internal Server · 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 WEB_SERVER Generic Webshell Accessed on Internal Server";
    flow:established,to_client;
    file.data;
    content:"<form method=post style=|22|font-family:fantasy|3b 22|>";
    content:"Password: <input type=password name=pass style=|22|background-color|3a|whitesmoke|3b|border|3a|1px solid #FFF|3b 22|><input type=submit value='>>' style=|22|border|3a|none|3b|background-color|3a|"; nocase; distance:0; fast_pattern;
    classtype:web-application-attack;
    sid:2030066; rev:2;
    metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_04_29, deployment Perimeter, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_29;
)

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