> Exactly.  The first step after someone finds an exploit on 
> your site/server is usually to upload some kind of backdoor 
> utility, which are usually caught by virus scanners.

That sentence is correct, right up until you get to "which which are usually
caught by virus scanners."

If someone finds an exploit on your server, that exploit likely involves
getting a server to run code in a higher privilege level than is
appropriate. Once that happens, it is trivial to bypass or disable the virus
scanner.

Dave Watts, CTO, Fig Leaf Software
http://www.figleaf.com/

Fig Leaf Software provides the highest caliber vendor-authorized 
instruction at our training centers in Washington DC, Atlanta, 
Chicago, Baltimore, Northern Virginia, or on-site at your location. 
Visit http://training.figleaf.com/ for more information!


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