Yaalon Hints Israel behind Flame Malware
http://www.israelnationalnews.com/News/News.aspx/156294#.T8TfxFE69v0
Considering the number of mathematicians, electrical engineers, and computer programmers that live in Israel and who immigrated to Israel from easter Europe and Russia I would think that they are quite capable of performing something this complex. The time line is interesting for how long the code has been setting there just waiting to be activated.