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Junkie is a reasonably simple multipartite virus that infects COM files, MBRs and floppy boot sectors. The virus only becomes resident when started from a boot sector; the COM form acts only as a dropper for the MBR form, doing nothing else.
On hard disk, the virus' two extra sectors of code are stored on the first track; on floppy, they are located at the end of the disk, and (being unprotected) may be overwritten by data. The code is encrypted in a very basic way.
Junkie infects COM files either when they are opened or when they are executed. If a virus scanner does not find Junkie in memory, it could infect all COM files on the system as it scans. However, since Junkie is quite old, this is no longer a real problem.
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