His computer, doing his taxes and it spread throughout ukrain ukraine. >> that's exactly what happened. it started in the ukraine and basically was part of an update of tax accounting software. once it got loaded to windows-based machines, took advantage of this update issue and got into that vulnerability and then spread through a wormlike tendency. it can get through based on how it's connected to other computers. >> heather: and the speed at which he was able to spread is tied into the nsa. >> it's taking advantage of a vulnerability from unpatched machines and microsoft windows operating s...