Re: Is this a virus? (PC)

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1 total messages Started by Paul Ducklin Fri, 13 Nov 1992 16:20

#4200

Author: Paul Ducklin
Date: Fri, 13 Nov 1992 16:20

20 lines
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Thus spake rknazik@x102a.harris-atd.com (knazik bob):
>My 386 PC reports that I have 654360 conventional memory when I do a
>"chkdsk" or a "mem" (DOS 5.0).  This is 1024 short of the expected
>amount.  I seem to remember that there was a virus that caused this
>result, but VSCAN finds nothing wrong.  Does anyone know if this is a
>virus or just some weird hardware failure ?  Any help is appreciated.

Some BIOSes use the top 1KB of the DOS 640KB area as an extension to
the BIOS data area at 0040:0000, so 1KB missing at the top of DOS
memory might be quite normal.

Boot clean and then try MEM. The figure you see reported after a clean
boot is the "normal" figure for your PC. If you boot from hard disc and
see less than "normal", you may then get worried..

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Paul Ducklin                                       duck@nuustak.csir.co.za

  CSIR Computer Virus Research Lab * Box 395 * Pretoria * 0001 S Africa

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