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Windows Defender Antivirus detects and removes this threat.
This threat locks your PC and displays a full-screen message, commonly called a "lock screen".
It pretends to be from the FBI or a national police force and tries to scare you into paying a fine to unlock your PC.
See the Win32/Reveton family description for more information.
You can also read more about this type of malware on our ransomware page.
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.