Two ransomware attacks happened in March where the program encrypted files on computer systems in hospitals, in Kentucky and California, then demanded payment in bitcoin for access to the encryption key.
This month a similar attack happened on a hospital in Calgary.
Citrix recently reported a large percentage of enterprises are now buying bitcoin to protect against such an attack.
Backing up systems is important to recovery. Another type of countermeasure is VDI where the desktop is rendered from a remote VM where the information is protected.