This is a benign memory resident encrypted parasitic virus that hooks INT 21h, and writes itself to the end of EXE files that are executed or opened. If a date and month are equal in number, e.g., January 1, February 2, etc, the virus also hooks INT 1Ch (timer), and in time, displays the following message:
Virus April - 1st version - Copyright (C) 1.4.1994
I look forward to meet with you again.
Yours sincerely VirSoft Blansko - Czech Republic
