The activity of Hidden Tear variants have been on the rise since March this year and there seems to be no signs of it stopping. The popularity of the open-source ransomware continues to encourage the development of more dangerous versions of the original, which cybercriminals are using in attacks that are growing more sophisticated.

https://www.trendmicro.com/vinfo/us/security/news/cybercrime-and-digital-threats/ransomware-taking-advantage-of-older-popular-variants