If you aware of my last post on Jan 3, the value of 1 Bitcoin was = 1022.35 US Dollar on Jan 3. Today the value of 1 Bitcoin equals 1932.38 US Dollar. Recent ransomware attack might have caused some hike, since people have converted their local currency into Bitcoins. The coin's value was only $0.05 in 2010.
Wannacrys creators are now in trouble since they aren't sure how to cash their bitcoins. They have only used three bitcoin addresses to collect the money and it is possible to track those address and where the money goes. If they had used multiple address then it would be more difficult.