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Alert level: Severe Detected with Windows Defender Antivirus
Also detected as: Backdoor.Win32.Azbreg.lui (Kaspersky)
Windows Defender detects and removes this threat.
This threat locks your PC and displays a full-screen message, commonly called a "lock screen". If this threat asks you to pay a fee or fine, do not pay it. The message is a fraud.
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.
Typically, this threat gets on your PC when you visit a hacked webpage.