After the Week of WannaCry, the ransomware scene looks to be going back to normal, with the persistent ransomware known as Cerber (Detected by Trend Micro as RANSOM_CERBER family) jumping back in the limelight—this time using the “Blank Slate” spam campaign that was discovered in early 2017. 

https://www.trendmicro.com/vinfo/us/security/news/cybercrime-and-digital-threats/ransomware-recap-business-as-usual-after-wannacry-surge