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    Also called a dropper program or a virus dropper, a program that when run will install a virus, Trojan horse or worm onto a hard drive, floppy disk or other memory media. The dropper itself is not a virus it does not replicate; instead, it s more like a Trojan horse in that it carries the malicious code with it and is not detected by virus-scanning software because it is not an infected file but carries the code to “drop” a virus into a system. Droppers are uncommon.