This boot sector virus infects both boot sectors of floppy disks and partition tables on hard disks. Infections occur when a system is booted from a disk infected with the virus. It is not necessary for the boot sequence to be complete, the virus will still infect.
The virus is programmed to load its viral program into memory. Once memory resident, the virus will infect all floppy disks that are not write-protected as they are accessed. In addition to infecting, Leandro contains a non-malicious payload. On October 21st of any year, the virus will display the following text:
Leandro and Kelly! GV-MG-Brasil
The text is followed by a date which typically matches the date of the first infection on the system.