This is a widespread false alarm on a demonstration program.
There is no virus or trojan by this name.
GHOST.EXE is a Windows program which displays a graveyard and a set of
ghosts in a window. On Friday the 13th, the title of the screen was
changed to 'Happy Friday the 13th!' and the ghosts started flying
around the Windows desktop. This program was analyzed and found
harmless.
The confirmed-clean versions of this program have the following CRCs
as displayed by PKUNZIP:
Length Method Size Ratio Date Time CRC-32 Attr Name
------ ------ ----- ----- ---- ---- -------- ---- ----
28096 DeflatN 14145 50% 30-10-96 13:20 5dce8738 --w- GHOST.EXE
28064 DeflatN 14142 50% 13-11-96 13:45 a6839c30 --w- GHOST2.EXE
28065 DeflatX 14121 50% 11-22-96 12:11 f47d5cbd --w- GHOST3.EXE
------ ------ --- -------