What do viruses do on my computer, anyway? Why is it so important for me to install updates? Why are these two things related?

This is a follow-up to my earlier article ‘How do people make money off of Viruses‘ and is from an Internet Storm Center diary entry describing very simply what viruses do.  Basically, the author has noticed some questionable traffic on his network that the antivirus completely missed and, after some investigating, found that the virus on the computer was transmitting data to a server in the Ukraine every time the computer visited a website (think bank, gmail, etc.).  Further investigation confirmed that the virus was installed after the user visited a newspaper website that happened to have a poisoned ad displayed on it (starting to sound familiar?).  It’s a very quick read and good insight into why it is so incredibly important to keep your computer up-to-date.


Article – http://isc.sans.edu/diary.html?storyid=14428