W32.Vundo/MS Juan Trojan Virus definition and removal tips. The Vundo Trojan virus is one of the nastier Trojan viruses that you can get your computer infected with.
First seen in 2008, TDSS was known for its ability to exist in systems without being discovered and the challenge it presents in terms of cleanup. The name "TDSS" was derived from a string that was consistently seen in dropped component files and registry entries in earlier variants although this later changed to mere random strings, which added to the difficulty in detecting TDSS samples.