Ransomware has been around for years and has inflicted financial losses estimated in the billions of dollars. As one of the most lucrative types of malware, from a financial perspective, ransomware developers have invested considerable time, effort, and knowledge into perfecting both its delivery mechanisms and its capabilities.

https://labs.bitdefender.com/2018/10/gandcrab-the-most-popular-multi-million-dollar-ransomware-of-the-year/