Virus.DOS.Zortech.836 or Zortech is a virus that runs on MS-DOS.
Zortech is a memory resident parasitic virus. It hooks INT 21h and writes itself to the beginning of .COM and .EXE files that are executed. Depending on the system time it reboots the computer.
It contains the internal text string:
Zortech (C). Take Care of SoftWare ...
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