Did it also spread in the West? How did they prevent it from affecting also friendly countries nuclear programs, is Iran the only country working at that stage of the technology?
... its way towards ...
> a very specific environment (iran nuclear plant)
Stuxnet was a full stack of plugins (which lends huge weight toward the early "big team" design and build theories of first observers).
There was a payload intended for very specific centrifuges ... and there was replication toward target logic ( Farsi language | locale seeking targets for copying ) IIRC.
The "work" of Stuxnet wasn't limited to screwing up the centrifuges, it also had seeking and limited comms.