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- SYSCHK Version 1.0
- Copyright (c) 1988 Terratech. All rights reserved.
-
- This program was written to provide protection from the corruption of the
- system files, be it malicious or inadvertent. However, it is specifically
- targeted against the viral form of trojan programs. SYSCHK will detect the
- slightest change in any of the three system files. I would recommend the
- following installation procedure:
-
- assuming that you boot drive is C
-
- enter SYSCHK C:
- and you will see something similar to the following:
-
- C:\IO.SYS: checksum = 61278
- C:\MSDOS.SYS: checksum = 24699
- C:\COMMAND.COM: checksum = 30785
-
- edit the following lines into the beginning of AUTOEXEC.BAT,
- using the checksums given for your system:
-
- SYSCHK 61278 24699 30785 C:
- IF ERRORLEVEL 32 GOTO SYSCHKERR
- IF ERRORLEVEL 16 GOTO FOPENERROR
- IF ERRORLEVEL 2 GOTO CSUMERROR
- .
- .
- :SYSCHKERROR
- .
- .
- :FOPENERROR
- .
- .
- :CSUMERROR
- .
- .
-
- If you discover that any of your system files have been modified, you should
- IMMEDIATELY reboot with a known safe boot disk and run the DOS command SYS or
- its equivalent.
-
- The command SYSCHK /? will provide additional information.
-