These are not dangerous memory resident parasitic viruses. They hook INT 1Ch, 21h and write themselves to the end of COM- and EXE-files that are executed. These viruses contain the data area that is the code of old game PAC-MAN, and this code is packed by PKLITE utility. These viruses unpack that game and sometimes launch it. On execution of this game the viruses hook INT 09h and on Alt-Ctrl-Del pressing they return control to interrupted program. The code of the game contains the text strings:
Recorre la Habana
Presione la tecla ESPACIO para comenzer
en busca de nuevas aventuras
Copyright: NASA-MAN 1993
Oprima ESPACIO para seguir PAC-MANeando all
oystick button FOR JOYSTICK PUNT.
