I think there are very few credible things about this story.

why would the computer security people tell everyone that it was metasploit? usually, IT staff tells people very little about current or ongoing security events.

why would workstations have speakers? perhaps they were internal speakers, but still.

are the phrases and word choices used in the e-mail consistent with the type of person who purports to have sent the e-mail? I'd like someones more expert opinion here on whether an Iranian person would say "maxed out", for example.

and finally, why would a real nuclear scientist risk death and imprisonment to tell an antivirus company that someone had compromised their computers to play AC/DC?

The workers at Iran's nuclear facilities are free to just do whatever the hell they want now and if they get busted they can blame it on US/Israeli hackers.

Sounds to me like the most plausible explanation so far. Some connected employee/s breached internal IT security protocol by transferring music to their workstations, maybe even being caught at a night shift blasting music. They tried to cover it up with some stories and it got out of hand.

I'm serious, I think anyone who's been in (any) military capacity can see such a thing happening.

Every time I come to any conclusion about what's happening with Iranian computers, I'm proven wrong weeks later. It is nuts what is going on here. I agree: playing AC/DC on nuclear facility computers sounds too theatrical to be real. Which probably means it was a Sepultura/Muppets mashup and not AC/DC.

The speakers blared Thuderstruck this time Iranians, next time it will be a Creed/Nickleback marathon. Don't be that country.

Conan O'Brien just stole your joke.

And I posted it an hour before this guy. It's an easy joke progression.

Your comment is showing 2 hours after mine, but you're right it's an obvious joke. When my patent is issued my lawyers will be in contact with you.

I will send my cybermen to deal with your lawyers.

This isn't Mikko Hypponen's sense of humour - I'd say it's real, even if it is ridiculous.

Could be a faked email by someone winding him up.