There are 2 variants:
When the virus is loaded into memory, it hooks INT 21h to infect any EXE executable file that is closed by writing itself at the end of the file. On execution or opening the infected file the virus would temporarily disinfect it.
This virus deletes files in any extension having their filename starts with the string:
The infection size varies between different files.
The following table shows the memory usage of the variants.
|Variant||Memory usage in bytes|
When an infected program is run on May 27th, the virus switches the display to video mode, and manifest itself with a video effect plus a message:
Magdzie T. - jutro Twoje urodziny!
Translation (from Polish):
(For) Magda T. - tomorrow's Your birthday!
The virus contains the internal text string: