Well, it could have been funded by Martians :) But the main suspect right now is Israel, not the US. This guy clearly has an agenda, but claims "My major scoop is that my senior Israeli source confirms that it is a product of Israeli cyberwarfare experts." http://www.richardsilverstein.com/tikun_olam/2012/05/28/flam...
If it was Israel, I'd bet dollars to donuts that they got help from American agencies. Either way, a professional government agency somewhere, which apparently knows a lot about cryptology and presumably computer forensics, designed this thing and issued a data shredding command. My point still stands in that the number (and types) of writes they did would be very informative.
Silverstein often quotes a senior Israeli official to say it's Israel's fault whenever something goes wrong in the Middle East, but he never produces evidence and his assertions are rarely backed up by independent reporting. I suspect he's making it all up, or his senior official source is a senior official in a political action group and not the government. In any case, he is not a reliable source.
You know nothing about me or my source. But I'll correct your many errors. My source doesn't say it's Israel's fault "whenever something goes wrong in the Middle East." That's only your distorted interpretation. But when he does inform me of an imporant development related to Israeli national security, I report it. Sometimes I agree with my source, sometimes not. My source, for example, supports Israel's covert war against Iran. I don't. But I report it because I'm a good journalist.
Second, my source has extensive Israeli military, political & intelligence experience. Third, almost all his scoops have turned out to be true. None have been proven false. Now, what are your bona fides & do they match his?