Well first a UDF worm is microsoft specified. So your MSQL must be running on microsoft windows. If this is the case, you may want to check your firewall and password. If its not secure you are liable to get this worm. When this worm find a weak system that has been exposed to the internet it then implants itself and uses that computer to infect other computers.So it really affects other computers through yours even though of course are infected as well. But it pretty muc looks for a breeding ground.
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