[uxp]

Considering the size of the file, (and the fact I have not examined StuxNet), I'd assume that there is a good chance it has enough logic to determine which factory it is in by pure brute force.

If the main fan control gives a fairly standard reading, it shouldn't be too difficult figuring out what the particular factory it has infiltrated has wired that point to, for example.

Also, I haven't heard any definitives on what kind of factory this is targeting. I do know that there aren't many companies that develop and design high tech industrial facilities. Despite StuxNet having infected thousands (millions) of personal PCs, it really is only looking for maybe a few dozen or so in the world that are of the right type. Combine that with a low number of factory designs, and it could very well have a pre-determined database of how its intended targets are wired.