ET WEB_CLIENT Generic Webshell Password Prompt Accessed on External Compromised Server

Query · suricata

flow:established,to_client;
file.data;
content:"<form method=|22|POST|22|>|0d 0a|";
content:"Password|3a 0d 0a|"; distance:0;
content:"<input type=|22|hidden|22 20|name=|22|auth|22 20|value=|22|"; distance:0;
content:"<input type=|22|password|22 20|name=|22|password|22|>|0d 0a|"; distance:0;
content:"<input type=|22|submit|22 20|value=|22|>>|22|>|0d 0a|"; fast_pattern; distance:0;
Raw source ET WEB_CLIENT Generic Webshell Password Prompt Accessed on External Compromised 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 Password Prompt Accessed on External Compromised Server";
    flow:established,to_client;
    file.data;
    content:"<form method=|22|POST|22|>|0d 0a|";
    content:"Password|3a 0d 0a|"; distance:0;
    content:"<input type=|22|hidden|22 20|name=|22|auth|22 20|value=|22|"; distance:0;
    content:"<input type=|22|password|22 20|name=|22|password|22|>|0d 0a|"; distance:0;
    content:"<input type=|22|submit|22 20|value=|22|>>|22|>|0d 0a|"; fast_pattern; distance:0;
    classtype:web-application-attack;
    sid:2030500; rev:2;
    metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_07_13, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_13;
)

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