ET MALWARE Potential FakeAV HTTP GET Check-IN (/check)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET MALWARE Potential FakeAV HTTP GET Check-IN (/check)";
    flow:established,to_server;
    urilen:6;
    http.method;
    content:"GET";
    http.uri;
    content:"/check"; nocase;
    http.user_agent; bsize:27;
    content:"Microsoft|20|Internet|20|Explorer"; fast_pattern; nocase;
    http.header_names;
    content:!"|0d 0a|Referer|0d 0a|"; nocase;
    content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a|"; startswith;
    reference:url,microsoft.com/security/portal/threat/encyclopedia/entry.aspx?Name=Rogue%3AWin32/FakeSpypro;
    reference:url,www.malwaredomainlist.com/forums/index.php?topic=3190.420;
    classtype:trojan-activity;
    sid:2010597; rev:9;
    metadata:created_at 2010_07_30, performance_impact Moderate, signature_severity Major, updated_at 2024_04_10;
)