U.S. businesses and consumers have experienced more than $18 million in losses stemming from a single strain of ransomware called CryptoWall. The Internet Crime Complaint Center says it received 992 CryptoWall-related complaints from April 2014 to June 2015. Ransomware is a type of malware that locks victims’ PCs and encrypts all of the user data until victims pay attackers a ransom. Even if victims pay, there is no guarantee that they will regain access to their PC or obtain the decryption key for their data.”]
Source: https://www.govinfosecurity.com/fbi-alert-18-million-in-ransomware-losses-a-8355