https://www.bleepingcomputer.com/news/security/ragnarok-ransomware-targets-citrix-adc-disables-windows-defender/

A new ransomware called Ragnarok has been detected being used in targeted attacks against unpatched Citrix ADC servers vulnerable to the CVE-2019-19781 exploit.

Last week, FireEye released a report about new attacks exploiting the now patched Citrix ADC vulnerability to install the new Raganarok Ransomware on vulnerable networks.