tte@metaware.metaware.com (Thuan-Tit Ewe) (12/08/89)
Regarding your posting, I know of a virus which will do just such a thing.
After disassemblying Jerusalem B virus, I saw code in there triggered by
the clock interrupt that will scroll a region of the screen some two lines
up.
Your best bet is to use any anti-viral program to check your system and
make sure it's not affected. Also, to see if it a virus attact:
1. Get a good copy of any small program from a floppy. (Maybe debug.com from
your DOS distribution)
2. Note its size
3. Run the program that will cause the screen scroll. (Or any wierd problem)
4. Exit program on step 3, and execute the small program.
5. Exit the small program and check to see if the size increased.
If it does, chances are very, very, very good that you have a virus problem!
Of course, if the small program has already been infected, you won't see
any size increase.
Thuan-Tit Ewe MetaWare Inc
tte@metaware.com (408) 476-8936
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