Troj/BaysVBVM-A is a hacked version of the Microsoft Visual Basic 6 virtual machine (msvbvm60.dll) that is typically dropped by the W32/Baysur family of Visual Basic worms with the name Thumbs.db or some variation thereof.
Unlike the real msvbvm60.dll, the icon of Troj/BaysVBVM-A is that of a Windows XP folder.