Trojan:Win32/Vundo.QA 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 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.