Considering how much effort went into stuxnet and flame this seems to be rather weird. Go to extreme lengths in coding malware to... play AC/DC? Something doesn't seem quite right.
I would guess you are right. Not really the paranoid type, but when considering things like this with Iran I wouldn't be surprised if it was government doings and the AC/DC thing is a distraction from whatever they really did.
The choice of music is excellent though ;)