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Trojan:Win32/Vundo.KO
Detected by Microsoft Defender Antivirus
Aliases: Win-Trojan/MalCrypted.Gen (AhnLab) Trojan.Vaklik.AW (BitDefender) PWS-Zbot (McAfee) Infostealer.Gampass (Symantec) Trojan:Win32/Vundo.gen!AP (Microsoft)
Summary
Trojan:Win32/Vundo.KO is a component 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.
This particular component is used to download and execute arbitrary files to the affected computer. In the wild, we have observed Trojan:Win32/Vundo.KO downloading and installing additional Vundo components such as Trojan:Win32/Vundo.gen!AT.
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 the Microsoft Safety Scanner (http://go.microsoft.com/fwlink/?LinkId=212742). For more information, see http://www.microsoft.com/protect/computer/viruses/vista.mspx.
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