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Pc Doctor24 Computer Help - Virus Protection Vocabulary - C

Services:

Cavity Virus Checksum Clean
Cluster Virus Cold Boot COM File
Companion Virus Compromise Cookie

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Check out the Virus Glossary for the latest virus terminology:

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Cavity Virus

A cavity virus overwrites a part of its host file without increasing the length of the file while also preserving the host's functionality.

Checksum

An identifying number calculated from file characteristics. The slightest change in a file changes its checksum.

Clean

adj. A computer, file or disk that is free of viruses.

v. To remove a virus or other malicious software from a computer, file or disk. Also: Disinfection.

Cluster Virus

Cluster viruses modify the directory table entries so the virus starts before any other program. The virus code only exists in one location, but running any program runs the virus as well. Because they modify the directory, cluster viruses may appear to infect every program on a disk. Also: File System Virus

Cold Boot

To start the computer by cycling the power. A cold boot using a rescue disk (a clean floppy disk with boot instructions and virus scanning capabilities) is often necessary to clean or remove boot sector infectors. See Also: Boot, Warm Boot

COM File

A type of executable file limited to 64 kb. These simple files are often used for utility programs and small routines. Because COM files are executable, viruses can infect them. This file type has the extension COM.

Companion Virus

Companion viruses use a feature of DOS that allows software programs with the same name, but with different extensions, to operate with different priorities. Most companion viruses create a COM file which has a higher priority than an EXE file with the same name.

Thus, a virus may see a system contains the file PROGRAM.EXE and create a file called PROGRAM.COM. When the computer executes PROGRAM from the command line, the virus (PROGRAM.COM) runs before the actual PROGRAM.EXE. Often the virus will execute the original program afterwards so the system appears normal.

Compromise

To access or disclose information without authorization.

Cookie

Cookies are blocks of text placed in a file on your computer's hard disk. Web sites use cookies to identify users who revisit the site.

Cookies might contain login or registration information, "shopping cart" information or user preferences. When a server receives a browser Log a Support/Service Ticketthat includes a cookie, the server can use the information stored in the cookie to customize the Web site for the user. Cookies can be used to gather more information about a user than would be possible without them.

 

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