No, around 20 Mb as far as i heard. Big enough though, and much larger than Stux. As POTUS was reported to have said recently, it was developed in an Israelian-US venture, and its launch timed for beginning of may, 2012.
Also, because it was spread via an MS update, i do not quite believe Mickeysoft did not know anything about that - after all they are a US company and 'visited' regularly, by the US major secret services. Something every non-US company should consider when it uses MS programs, and cloud computing ..
Is the sending of such a thing not an act of war ?
So Iran could now legally 're'-declare war itself, to the US ?

I think they all (Iran AND US) are frantically searching for a juristically clean 'explanation'.