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.

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.

Trojan:Win32/Vundo.gen!BY is a generic detection for members of the Win32/Vundo family, a multi-component family that delivers 'out-of-context pop-up advertisements'. Trojan:Win32/Vundo.gen!BY has also been observed modifying and redirecting search engine results on specified web browsers.