We still don’t know exactly who brought the worm in. Some suspect a Mossad spy, a CIA officer, a Dutch mole, a well-paid insider, or an unwitting contractor at one of the five Iranian companies that Olympic Games targeted in the lead-up to the first attack. And we may only find out in 2039, when Olympic Games is set to be declassified. For now, all we know is that it had to have been a human with an infected thumb drive.

