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Viruses are designed to Replicate themselves. In order for it to do this it must be permitted to execute a code and it usually is written into your memory. They quite often attach themselves to a file that may be a part of one of your programs. When the user starts this program, the virus code is executed and infections takes place.

Most viruses can be broken down into two groups; Nonresident and Resident. A nonresident virus seaches for a host that it can infect. After infecting these targets it transfers control to the program it has infected. A resident virsus dosen’t look for a host but loads itself directly into your computer’s memory. Every time you try to rid your computer of this virus, it will reoccur the next time you re-start your computer because it’s still lodged in your memory. It can also infect new hosts when some files are accessed by another program or operating system.

The Nonresident virus has a finder module has a finder “finder module” and a “replication module”. The finder module finds a file to infect and the replication module does the infecting.

The Resident Virus also has a replication module very similar to the nonresident virus but is not called a finder module. This virus loads the replication module directly into your memory so it will be executed every time an infected operating system is executed. It may infect several programs in your computer.

In conclusion, some viruses tag along looking for a host which would be some program or attachment you downloaded. It will then trigger some data file on your computer to trigger the execution of a code that is hidden within a data file.

I was reading howstuffworks blog. They have a good article on viruses. Check it out here.

Posted on January 14th, 2008 at 20:27 by Alex Smith in computer security - Comments (0)

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