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A phage virus is a computer virus which, rather than attaching to host files, will modify host file programs. It usually modifies the beginning of the executable code, destroying files in the process. If an infected file is transferred, the phage virus continuously transfers to other executable files until they are all infected.
A phage virus is destructive because it rewrites the programming of its host with its own code, rendering the host file unusable and resulting in a deleted or corrupted program.
A well-known example of a phage virus is the PalmOS/Phage, also known as the Palm Virus and Palm.Phage.Dropper, which rapidly self-propagates on handheld devices with the Palm operating system (OS), resulting in program elimination. This Phage virus incarnation transfers between devices if files are downloaded from the Web, shared via infrared (IR) beaming or synced with a PC.