"At the moment, we are in the face of an escalating threat. The numbers are going up; I am worried about how the numbers will continue to grow when people go to work and turn (on) their machines on Monday morning." He said Europol and other agencies did not yet know who was behind the attack but "normally it is criminally minded and that is our first working theory for obvious reasons". "Of course there are amounts that are being demanded, in this case relatively small amounts - $300 rising to $600 if you don't pay within three days," he said.

http://www.cnbc.com/2017/05/14/cyber-attack-hits-200000-in-at-least-150-countries-europol.html