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Alert level: Severe Detected with Windows Defender Antivirus
Also detected as: JS/Fraud.NAS!tr (Fortinet) Trojan.Win32.FakeAV (Ikarus)
Windows Defender detects and removes this threat.
This threat is detected in a webpage that shows a fake security scanner. It falsely tells you that your PC is infected with viruses and that you need to install other software to disinfect it. The software it offers for install is usually a rogue security software, which doesn't clean your PC and instead tells you that you need to pay for more, nonexistent, cleaning.
See the Rogue security software page for more information.