ET WEB_CLIENT DXF Extension File Detection Access Flowbit Set

alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (
    msg:"ET WEB_CLIENT DXF Extension File Detection Access Flowbit Set";
    flow:established,to_client;
    flowbits:set,DXF.Ext.Access;
    content:"|20 20 30|";
    content:"|0A 53 45 43 54 49 4F 4E|"; within:10;
    content:"|20 20 32|"; within:5;
    content:"|48 45 41 44 45 52|"; distance:0;
    content:"|0a|"; within:2;
    flowbits:noalert;
    classtype:not-suspicious;
    sid:2012152; rev:2;
    metadata:affected_product Web_Browsers, affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2011_01_06, deployment Perimeter, confidence Medium, signature_severity Major, tag Web_Client_Attacks, updated_at 2019_07_26;
)