Vundo is often installed as a browser helper object (BHO) without your consent, by other malware.

This family uses advanced defensive and stealth techniques to escape detection and to hinder removal. 

Windows Defender detects and removes this threat.

This threat is classified as a trojan downloader. It tries to download and install other malware or unwanted software.

Some downloader trojans target specific files on remote websites. Others target a specific URL that points to a website with exploit code that can automatically download and run software or malicious code on your PC.

More details are available in the Win32/Vundo family description.

Windows Defender detects and removes this threat.

This trojan dropper can install malware or unwanted software on your PC.

Commonly, it also installs a backdoor which gives a hacker remote access to your PC. A hacker can then upload and install other malware or unwanted software.

More details are available in the Win32/Vundo family description.

Trojan:Win32/Vundo.gen!AW is the generic detection for components 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.

Win32/Vundo is often distributed as a DLL file and installed on an affected computer 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.

For more information, please see the Win32/Vundo analysis elsewhere in the Microsoft Malware Protection Center encyclopedia.

Windows Defender detects and removes this threat.

Trojan:Win32/Vundo.RU is a variant of Win32/Vundo, a multiple-component family of programs that display pop-up ads. They also download and run files and stop security programs from running.

Trojan:Win32/Vundo.OD is a trojan that is a member of a multi-component trojan family of programs that deliver 'out of context' pop-up advertisements. It also drops files that are capable of downloading other malware and executes arbitrary files.