Backdoor.Sdbot.N Question

["James Patterson Wicks" <pwicks () oxygen com>]

Anyone know how Backdoor.Sdbot.N spreads?  This morning we had several users pop up with this trojan (or a new 
variant).  These users generated a ton of traffic until their machines were unplugged from the network.  There systems 
have all the markers for the Backdoor.Sdbot.N trojan (registry entries, etc), but was not picked up by the Norton virus 
scan.  In fact, even it you perform a manual scan after the trojan was discovered, it is still not detected in the scan.

I would also like to know if this is also an indicator of not having the patch for the Blaster worm.

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