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Trojan:Win32/Vundo.KT
Detected by Microsoft Defender Antivirus
Aliases: Backdoor.Win32.Buterat.jm (Kaspersky)
Summary
Trojan:Win32/Vundo.KT is a member of Win32/Vundo - a multiple component family of programs that deliver 'out of context' pop-up advertisements. They may also download and execute arbitrary files. Vundo is often distributed as a DLL file and installed on an affected machine as a Browser Helper Object (BHO) without a user's consent. This family uses advanced defensive and stealth techniques to escape detection and to hinder removal.
Manual removal is not recommended for this threat. To detect and remove this threat and other malicious software that may have been installed, run a full-system scan with an up-to-date antivirus product such as Microsoft Security Essentials, or the Microsoft Safety Scanner. For more information about using antivirus software, see http://www.microsoft.com/security/antivirus/av.aspx.