#3HUB COMPUTER VIRUS CODE#
Once the virus has its hooks into your computer, it can start executing its payload, which is the term for the part of the virus code that does the dirty work its creators built it for. (We’ll get into more detail on the different types of computer virus a bit later on.) (A resident virus does this to programs as they open, whereas a non-resident virus can infect executable files even if they aren't running.) Boot sector viruses use a particularly pernicious technique at this stage: they place their code in the boot sector of the computer's system disk, ensuring that it will be executed even before the operating system fully loads, making it impossible to run the computer in a "clean" way. The general course goes something like this: the infected application executes (usually at the request of the user), and the virus code is loaded into the CPU memory before any of the legitimate code executes.Īt this point, the virus propagates itself by infecting other applications on the host computer, inserting its malicious code wherever it can. (We'll discuss the various ways that might happen in a moment, but for now, let's just take infection as a given.) How does the virus do its dirty work? Bleeping Computer provides a good high-level overview of how the process works. Imagine an application on your computer has been infected by a virus. You'll sometimes see virus used indiscriminately to refer to all types of malware, but we'll be using the more restricted sense in this article. A worm is a malware program that can run, reproduce, and spread on its own, and a Trojan is malware that tricks people into launching it by disguising itself as a useful program or document. A virus, as noted, is specifically a kind of malware that infects other applications and can only run when they run. Malware is a general term for malicious computer code. wormīefore we continue a brief note on terminology. When that application runs, it executes the virus code, with results that range from the irritating to the disastrous. It's a code snippet that inserts itself into some other application. Similarly, a computer virus isn't itself a standalone program. A biological virus like HIV or the flu cannot reproduce on its own it needs to hijack a cell to do that work for it, wreaking havoc on the infected organism in the process. Its name comes from the method by which it infects its targets.
Like other types of malware, a virus is deployed by attackers to damage or take control of a computer.
#3HUB COMPUTER VIRUS SOFTWARE#
A computer virus is a form of malicious software that piggybacks onto legitimate application code in order to spread and reproduce itself.
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