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Resident viruses contain a replication module that is similar to the one that is employed by nonresident viruses. However, this module is not called by a finder module. Instead, the virus loads the replication module into memory when it is executed and ensures that this module is executed each time the operating system is called to perform a certain operation. For example, the replication module can get called each time the operating system executes a file. In this case, the virus infects every suitable program that is executed on the computer. Business - Directory of business/finance/loan/mortgage related partner sites Computers - Directory of computer hardware/software/peripheral related partner sites Internet - Directory of webhosting/webdesign/internet marketing related partner sites Software - Directory of software related partner sites Web Design - Directory of web design/development related partner sites Web Hosting - Directory of web hosting related partner sites Web Promotion - Directory of search engine optimization/internet marketing related partner sites Web Resources - Directory of other web related partner sites Recreation - Directory of travel/hotel/cruise related partner sites Casino - Directory of online gambling/poker/blackjack/roulette related partner sites Health - Directory of online pharmacy/hospital/health related partner sites Shopping - Directory of online shopping/gift related partner sites Miscellaneous - Directory of all other partner sites
Resident viruses are sometimes subdivided into a category of fast infectors and a category of slow infectors. Fast infectors are designed to infect as many files as possible. For instance, a fast infector can infect every potential host file that is accessed. This poses a special problem to anti-virus software, since a virus scanner will access every potential host file on a computer when it performs a system-wide scan. If the virus scanner fails to notice that such a virus is present in memory, the virus can "piggy-back" on the virus scanner and in this way infect all files that are scanned. Fast infectors rely on their fast infection rate to spread |
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