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HDSENTRY.DOC
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1988-04-25
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HDSENTRY.ARC contains:
. HDSENTRY.ASM
. HDSENTRY.EXE
. HDSENTRY.COM
HDSENTRY, whether you run the .EXE or the smaller .COM file, is an interrupt
handler that intercepts service requests to the hard disk. If the service
call is not destructive in any way, the call is passed on to DOS, and is
executed in normal fashion. Calls to floppies are also merely passed on.
However, if a call is made to the hard disk that is destructive (write or
format), the handler prevents it from occuring. To alert you that something
is amiss, the handler will notify you with a beep in the speaker and a sign:
<<< ALERT >>> Destructive disk call prevented!
HDSENTRY is intended for use while you are checking out newly downloaded
programs from a bulletin board and you suspect those programs to be TROJAN
HORSEs, i.e., a program that purports to be something useful but that in
fact intends to scramble your hard disk for you (this could be done by keeping
you amused with colorful graphics and overwriting your File Allocation
Table, or reformatting your hard disk to the tune of Beethoven's Fifth,
although I doubt anyone low enough to try such things have any breeding).
A good strategy is to NEVER download from a BBS to your hard disk, always
to a floppy. However, the TROJAN may think of that and make calls to the
hard disk anyway. HDSENTRY will put a stop to that! If you have HDSENTRY
installed and YOU try to erase something on the hard disk, YOU will be
prevented (the filename will disappear as though you were successful, but
when you reboot, you'll find the file is still there. This is part of the
strategy just in case the TROJAN tries to see if it successfully erased
a file.) When you're finished checking your downloads, reboot your system
without HDSENTRY.
If you have any problems, notify Andrew M Fried (address is in the .ASM
file), NOT me!