Fact or fiction? Were Iranian reactors compromised again by a sophisticated worm/virus?

I was amused when I read this item from gawker.

The new worm is not shy in making its presence felt. In fact it is loud! It plays "Thunderstruck" by AC/DC at full volume at any time of the day. How effective is it?
It is said that an Iranian nuclear scientist wrote a Finnish computer security export that their nuclear program has been compromised and that it has shutdown down their automation network at Natanz and another nuclear research facility Fordo near Qom.

It sounds crazy and we hope it is just that or the cyber warfare may escalate into a real war between Iran and it avowed enemy state of Israel. We are curious how a virus which play back loud rock music can immobilize a sophisticated nuclear reactors. Something deeper is happening and we are out of the loop, we cannot know what the virus is really doing.

Hope this attack will make both Iranians and Israelis rock together for PEACE!