This virus should not be a serious threat - like all other overwriting
viruses it does not survive in the wild for any significant period of
time. Nevertheless, it has been reported a few times - possibly typed in
each time from the book by Ralf Burger where it was originally published.
At least eight 560 byte variants are known, but they are all of equally
little interest. They are named Burger 560-A, Burger 560-B etc.
A shorter variant originating in Taiwan.
This variant contains a minor error, which prevents it from recognizing
the files it has already infected, so they are overwritten again and
A 609 byte variant, containing a message which indicates it was written