alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (
msg:"ET WEB_SERVER Generic Webshell Password Prompt Accessed on Internal Compromised Server";
flow:established,to_client;
file.data;
content:"<form method=post>";
content:"Password: <input type=password name=pass><input type=submit value='>>'>"; fast_pattern;
classtype:web-application-attack;
sid:2030540; rev:2;
metadata:affected_product Web_Server_Applications, attack_target Web_Server, created_at 2020_07_16, deployment Perimeter, confidence Medium, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_16;
)