ET HUNTING GENERIC SUSPICIOUS POST to Dotted Quad with Fake Browser 1

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET HUNTING GENERIC SUSPICIOUS POST to Dotted Quad with Fake Browser 1";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.user_agent;
    content:"|20|MSIE|20|"; nocase; fast_pattern;
    content:!"Mozilla/4.0 (compatible|3b 20|MSIE|20|6.0|3b 20|DynGate)";
    content:!"Windows Live Messenger";
    content:!"MS Web Services Client Protocol";
    http.host;
    content:!"groove.microsoft.com";
    pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}/";
    http.request_body;
    content:!"grooveDNS|3a|//";
    http.header_names;
    content:!"X-Requested-With"; nocase;
    content:!"Accept-Encoding";
    content:!"Referer";
    classtype:bad-unknown;
    sid:2018358; rev:11;
    metadata:created_at 2014_04_04, performance_impact Significant, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_22;
)