Threat Description

Wyx

Details

Category: Malware
Type: Virus
Platform: W32
Aliases: Wyx, Preboot

Summary


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 following text:

31/03/98 WYX   


Removal


Automatic action

Once detected, the F-Secure security product will automatically disinfect the suspect file by either deleting it or renaming it.

More scanning & removal options

More information on scanning or removal options is available in the documentation for your F-Secure security product on the Downloads section of our Home - Global site.

You may also refer to the Knowledge Base on the F-Secure Community site for more information.

Contact Support

For further assistance, F-Secure customers can request support online via the Request support or the Chat forms on our Home - Global site.







Technical Details:Kaspersky Labs


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