Wyx is a not dangerous memory resident encrypted boot virus. The
virus code consists of two disk sectors. The virus infects the
MBR of the hard drive, the C: drive boot sector and boot sector
on floppy disks. The MBR of the hard drive gets infection on
booting from an infected floppy disk. To infect other drives the
virus hooks INT 8 (timer) and with delays checks if other drives
are in use, and depending on that infects either drive A:, or
drive B:, or boot sector if the C: drive.
While infecting the MBR sector the virus disables Virus
protection by resetting necessary field in the CMOS memory. The
original MBR, boot sector of the C: drive and second virus sector
are stored in the last sectors of the hard drive first track
(reserved track), the original boot sector of floppy drives is
stored at the end of root directory sectors.
The virus does not manifest itself in any way. It contains the
[Analysis: Kaspersky Labs]