![]() When the host file is accepted or loaded by a target system, the virus remains dormant until the infected host file is activated. Viruses are often attached or concealed in shared or downloaded files, both executable files-a program that runs script-and non-executable files such as a Word document or an image file. ![]() ![]() Worms do not require activation-or any human intervention-to execute or spread their code. The primary difference between a virus and a worm is that viruses must be triggered by the activation of their host whereas worms are stand-alone malicious programs that can self-replicate and propagate independently as soon as they have breached the system.
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