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Trojan:DOS/Yoddos
Aliases: Trojan.Smitnyl (Dr.Web) Rootkit.MBR.Yoddos.A (BitDefender) Virus.Boot.Smitnyl.a (Kaspersky)
Summary
Trojan:DOS/Yoddos is a bootkit malware that infects the file "userinit.exe" to decode and execute its encoded component, which is a trojan downloader.
To detect and remove this threat and other malicious software that may be installed on your computer, run a full-system scan with an appropriate, up-to-date, security solution. The following Microsoft products detect and remove this threat:
For more information on antivirus software, see http://www.microsoft.com/windows/antivirus-partners/.
