This family of ransomware consists of the Cryptowall Trojan. Most infections by this family to date have occurred in the USA.
Geographical distribution of attacks by the Trojan-Ransom.Win32.Cryptodef family
Geographical distribution of attacks during the period from 18 April 2015 to 18 April 2016
Top 10 countries with most attacked users (% of total attacks)
* Percentage among all unique Kaspersky users worldwide who were attacked by this malware