ET WEB_CLIENT Generic Webshell Accessed on External Compromised Server

Query · suricata

flow:established,to_client;
file.data;
content:"<b><br><br>Linux|20|";
content:"method=|22|post|22 20|enctype=|22|multipart/form-data|22 20|name=|22|uploader|22 20|id=|22|uploader|22|><input type=|22|file|22 20|name=|22|file|22 20|size=";
content:"<input name=|22|_upl|22 20|type=|22|submit|22 20|id=|22|_upl|22 20|value=|22|Upload|22|></form>"; fast_pattern;
Raw source ET WEB_CLIENT Generic Webshell Accessed on External Compromised Server · Suricata
Esc
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 Compromised Server";
    flow:established,to_client;
    file.data;
    content:"<b><br><br>Linux|20|";
    content:"method=|22|post|22 20|enctype=|22|multipart/form-data|22 20|name=|22|uploader|22 20|id=|22|uploader|22|><input type=|22|file|22 20|name=|22|file|22 20|size=";
    content:"<input name=|22|_upl|22 20|type=|22|submit|22 20|id=|22|_upl|22 20|value=|22|Upload|22|></form>"; fast_pattern;
    classtype:web-application-attack;
    sid:2032634; rev:2;
    metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2021_04_09, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_04_09;
)

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