I had someone ask me about this on anouther forum... seems they think I am all knowing :) (that's a joke)... and I was able to find some info on through Google http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=Trojan+virus+Stubby.A&btnG=Google+Search but nothing on the Norton site about it. In one of the threads I followed it mentioned the Norton does nothing to protect against this and that a better program was AVG http://www.grisoft.com/us/us_index.php although they have a removal program for it I still could not find info on the virus and how you get it. The person who asked me about it said they where on the web browsing when the got it.
more often than not these "downloaders" are spyware from companies like Claria/Gain/Gator or search installers from companies like ClearSearch. They sit on your system and when components have been removed from the "helper", it surreptitiously connects to the master site and downloads it anew.
This crap is annoying :evil:
The only reliable way, I have found, is to use a program like ad aware and then go into safe mode manually deleting files one at a time. This is very difficult if one of the buggers is a peper.trojan because if you leave 1 file behind, you have 50 again shortly after rebooting into normal mode.
Ad Aware (http://www.lavasoft.de)
Security Task Manager (http://www.neuber.com)
Ad Aware is the standard for spyware removal and STM is great for picking out files and registry keys for things AAW might miss.
An even more reliable way is not to use Windows...
;)
Gee I had forgotten about this post. I have been using Spybot Search and Destory (http://www.safer-networking.org/en/index.html).