While it is pretty difficult to answer what a piece of code written by a government would look like, a useful piece of information is also that the code targeted 4 different 0-day bugs [1].
If we consider previous reports on 0-day pricing [2], this alone could put the cost fo the worm at over $200000 making it more likely to be built by a well funded adversary.
[1] http://en.wikipedia.org/wiki/Zero-day_attack [2] http://weis2007.econinfosec.org/papers/29.pdf