ET WEB_CLIENT Generic Webshell Accessed on External Server

Query · suricata

flow:established,to_client;
file.data;
content:"<title> Mailer Created By"; nocase; fast_pattern;
content:"type=|22|submit|22 20|name=|22|Enoc|22 20|value=|22|Enviar|22|"; nocase; distance:0;
Raw source ET WEB_CLIENT Generic Webshell Accessed on External 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 $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_CLIENT Generic Webshell Accessed on External Server";
    flow:established,to_client;
    file.data;
    content:"<title> Mailer Created By"; nocase; fast_pattern;
    content:"type=|22|submit|22 20|name=|22|Enoc|22 20|value=|22|Enviar|22|"; nocase; distance:0;
    classtype:web-application-attack;
    sid:2030075; rev:2;
    metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_05_01, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_01;
)

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