System is a memory resident parasitic virus. It hooks onto INT 9 and 21h and writes itself to the end of .COM and .EXE files that are executed.
By using INT 9 (keyboard) the virus checks INT 1 (trace), and while tracing it displays the message:
ANTI VIRUS Writen By ABBAS KUHKAN Virus Found !
It then halts the computer.
The viruses also contain the text string: " KUH"
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