ET WEB_CLIENT Fake 404 With Hidden Login Form

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_CLIENT Fake 404 With Hidden Login Form";
    flow:established,from_server;
    http.stat_code;
    content:"200";
    file.data;
    content:"<title>404 Not Found</title>"; fast_pattern; depth:28;
    content:"background-color|3a 23|fff|3b|"; distance:0;
    content:"<form method=post>"; distance:0;
    content:"input type=password"; within:50;
    classtype:trojan-activity;
    sid:2025872; rev:3;
    metadata:attack_target Client_and_Server, created_at 2018_07_19, deployment Perimeter, performance_impact Low, signature_severity Major, updated_at 2020_11_18;
)