Downloader-BCV is a downloader Trojan that runs silently, no GUI message boxes appear on the screen.

It immediately copies itself onto the %system32 folder and creates a registry entry to run automatically upon system start, for example on win2k:

c:\WINNT\system32\systime.exe


It might also copy itself to the root of the c: drive, with the c:\systime.exe location actually hardcoded inside.

More information can be found at this McAfee page.