http://www.cnbc.com/id/39435594

"Deep inside the computer worm that some specialists suspect is aimed at slowing Iran's race for a nuclear weapon lies what could be a fleeting reference to the Book of Esther, the Old Testament tale in which the Jews pre-empt a Persian plot to destroy them."

(Personally, I suspect the Israelis.  They have the motivation and the smarts.  I say, more power to them.)