Invalid Boot Sectors (PC)

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1 total messages Started by Roger Riordan Thu, 24 Dec 1992 01:55

#4744

Author: Roger Riordan
Date: Thu, 24 Dec 1992 01:55

35 lines
1608 bytes

I recently wrote

>In a recent comment on a query by MOPURC01@ULKYVM.LOUISVILLE.EDU 
>(Michael Purcell) about a virus which allegedly made disks 
>unreadable I wrote.

>> If you put the wrong byte in the wrong place you can get the 
>> symptoms described.  ...

It appears the original message got lost, but the gist was that, 
IN THEORY, it is possible to write a BS virus which is invisible 
on an infected PC, but impossible to detect on an uninfected PC 
with any existing scanner because DOS will crash if any attempt is 
made to access an infected disk. 

More seriously, we have established that neither F-Prot V2.05, 
nor SCAN 8.9V97 will detect QUOX on 1.44M 3.5" disks.  

F-Prot reports

     Scanning boot sector B:
     Error: B: not found

SCAN less elegantly crashes with a critical error

     Scanning for known viruses.
     General failure reading drive B
     Abort, Retry, Fail?

Seasons Greetings to All,
(PS - I'll be away till early Jan)
Roger Riordan                     riordan.cybec@tmxmelb.mhs.oz.au

CYBEC Pty Ltd.                                 Tel: +613 521 0655
PO Box 205, Hampton Vic 3188   AUSTRALIA       Fax: +613 521 0727

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