The CDEF virus was discovered at Ithaca in the United States. It reproduces itself in the “Desktop” file by copying a CDEF resource, and is transmitted by simply inserting an infected disk into the Macintosh. It can affect the normal operation of the Macintosh but it does not specifically alter data. The System file, as well as some applications, may contain a CDEF resource without being infected.
The Rival CDEF vaccine also recognizes CDEF variants.
