Todays widely reported WannaCry ransomware attack is widespread, growing and has already yielded ~USD$12k in profits according to a Bitcoin Whos Who analysis of the BTC addresses involved. On May 12 the 3 bitcoin addresses known to be receiving extortion payments show receipt of 6.49372428 BTC in 39 separate transactions with ransom varying between .15 to .30 BTC each. None of the balances have been moved to new bitcoin addresses since receipt.
They say it's the largest ransomware attack ever made, NSA is guilty of this because hackers apparently used their tools to spread it. https://intel.malwaretech.com/botnet/wcrypt