The skyrocketing value of bitcoin and Ethereum has certainly has given cyber-criminals one more good reason to focus their efforts in this area.
The emails were discovered by security firm Cyren who says the malware especially focuses on FTP and web browsing software and other software that could have credential information.
£49 million worth of Bitcoins have been stolen from Hong Kong-based bitcoin exchange causing the price of Bitcoin to drop, and thus shaking confidence in the Bitcoin space.
Ironically, the cyber-criminals holding your computer files for ransom may be offering you a better customer experience than your average cable provider or insurance company.
Darktrace's CTO, Dave Palmer, says that while ransomware is on the rise and law enforcement can do very little to help, we are living in a "golden age of criminality".