These are dangerous nonmemory resident parasitic viruses. They write themselves to the end of either all files (*.*) or only .COM files of the current directory. If all files are already infected, some of these viruses format the C: drive sectors. Some of "Timid" viruses display the name of the file being infected. The beginning of infected files contain the word "GR" or "VI".
"Timid.320" displays:
HEH!HEH!HEH!HEH!
