Microsoft Defender Antivirus detects and removes this threat. 

Win32/Reveton is a family of ransomware that targets users from certain countries. It locks your PC and displays a localized webpage that covers your desktop and demands the payment of a fine for the supposed possession of illicit material.

PWS:Win32/Reveton.B extends the Reveton family’s functionality by stealing sensitive information and sending it to a remote attacker. It targets passwords for a number of file downloaders, remote control applications, FTP, poker, chat and e-mail clients. It can also steal passwords stored by browsers and in protected storage. It is used by Ransom:Win32/Reveton.

Our ransomware FAQ page has more information on this type of threat.

The trend towards increasingly sophisticated malware behavior, highlighted by the use of exploits and other attack vectors, makes older platforms so much more susceptible to ransomware attacks. From June to November 2017, Windows 7 devices were 3.4 times more likely to encounter ransomware compared to Windows 10 devices.

Read our latest report: A worthy upgrade: Next-gen security on Windows 10 proves resilient against ransomware outbreaks in 2017.