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Alert level: Severe Detected with Windows Defender Antivirus
Also detected as: RDN/Suspicious.bfr!v (McAfee)
Trojan:Win32/Kovter.B is a trojan that can prevent you from accessing your desktop. It might also automatically open a website containing adult content. It can receive commands to a hacker, and send information to the hacker about your PC.
You can read more about this threat on the Microsoft Malware Protection Center (MMPC) blog: