This virus has 2 versions:
Alfons.1424 is a very dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the beginning of COM- and the end of EXE-files (except COMMAND.COM) that are executed. Depending on the system date and system timer the virus erases the disk sectors. While erasing the virus displays the messages:
Alfons ! Synchronizing drive C: (Do not interrupt this operation !): 0% Done.