"... I recall an analysis of Stuxnet describing it as a conventional virus and it became visible specifically because like other viruses, it spread through a variety of systems. ..."
I read another open source report, NYT "Israeli Test on Worm Called Crucial in Iran Nuclear Delay" (Broad, Markoff & Sanger) ~ http://www.nytimes.com/2011/01/16/world/middleeast/16stuxnet... detailing how Stuxnet was a very specifically designed piece of code targeted for the Siemens made controller called a "P.C.S.-7" and a configuration for specific number of machines. A tailored cyber attack, the work of a trained marksmen not a random shooter.
I read another open source report, NYT "Israeli Test on Worm Called Crucial in Iran Nuclear Delay" (Broad, Markoff & Sanger) ~ http://www.nytimes.com/2011/01/16/world/middleeast/16stuxnet... detailing how Stuxnet was a very specifically designed piece of code targeted for the Siemens made controller called a "P.C.S.-7" and a configuration for specific number of machines. A tailored cyber attack, the work of a trained marksmen not a random shooter.