![]() Worms usually use vulnerabilities discovered in operating systems, hardware, or software to run their code without the user having to do anything at all. So if one computer at a company or school became infected, the program could quickly spread itself to other connected machines. For example, the Blaster Worm spread like wildfire in the mid-2000s thanks to a vulnerable open network port on Windows computers. They also spread by themselves, without human intervention. A virus needs a host program to infect and relies on users to spread that infected program using removable storage, email, or another similar transmission method.Ī worm exists as its own independent program, not as code attached to a third-party application. What’s a Worm?Ĭomputer worms and viruses are very similar in the sense that they self-replicate and execute a (usually) malicious payload on computer systems. The majority of viruses do harm your data or system on purpose by deleting data, stealing it, or otherwise doing something that’s not good for you or your PC. Some viruses have benign payloads that don’t actually damage anything. The payload can be anything the virus author wants it to be. Apart from trying to spread to other programs, viruses also have a payload.
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