What's it all about?
The Bitcoin part of this WannaCry hack raises two (so far) unanswered questions.
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First, VERY FEW PEOPLE know how to get or pay a specified amount of Bitcoin, and even those who know might have legal trouble acquiring it. Major corporations and government agencies are among the victims, and they are generally required to deal in real money.
You basically have to be inside the hacker community to get and handle the stuff.
Therefore, the attackers don't expect to gain lots of money. Most victims don't know how to pay or are legally unable to pay.
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Second, as I never tire of pointing out, Bitcoin is NSA's own currency. Unlike green rectangles or metal circles or various forms of scrip, every Bitcoin transaction passes through the Net, and NSA can track the sender and receiver even if it can't
immediately decrypt the content. Large numbers of victims are specifically known. If any of them have paid, the other end of the transaction can be spotted and the criminals can be caught. When law enforcement WANTS to find the recipient of an electronic message, it can always do so. But it hasn't.
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Putting those questions together: First guess, the hack is another NSA/CIA effort to start a war with RUSSIANAGGRESSION. Second guess, NSA/CIA effort to develop charges against RUSSIANWIKILEAKS.
Later third guess: Extortion to force Microsoft into the Deepstate loop.