It's a dangerous memory resident polymorphic parasitic virus. It hooks INT 21h and writes itself to the end of COM- and EXE-files that are accessed. On October, 20th it displays the message and reboots the computer:
If C doesn't work, use Pascal !!! --- many greetings to Niklaus Wirth !!! ---
It contains the additional text string:
(C) 1994 by B&J, Swabia