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Pc Doctor24 Computer Help - Virus Protection Vocabulary - F

Services:

False Negative False Positive Fast Infector
FAT FDISK /MBR File Viruses
Firewall    

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Check out the Virus Glossary for the latest virus terminology:

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False Negative

A false negative error occurs when anti-virus software fails to indicate an infected file is truly infected. False negatives are more serious than false positives, although both are undesirable. False negatives are more common with anti-virus software because the may miss a new or a heavily modified virus. See Also: False Positive

False Positive

A false positive error occurs when anti-virus software wrongly claims a virus infects a clean file. False positives usually occur when the string chosen for a given virus signature is also present in another program. See Also: False Negative

Fast Infector

Fast infector viruses, when active in memory, infect not only executed programs, but also those that are merely opened. Thus running an application, such as anti-virus software, which opens many programs but does not execute them, can result in all programs becoming infected. See Also: Slow Infector

FAT

File Allocation Table. The under MS-DOS, Windows 3.x, 9x, and NT (in some cases), the FAT is located in the boot sector of the disk and stores the addresses of all the files contained on a disk. Viruses and other malicious programs, as well and normal use and extended wear and tear, can damage the FAT. If the FAT is damaged or corrupt, the operating system may be unable to locate files on the disk.

FDISK /MBR

If you have MS-DOS version 5.0 or later, the command FDISK /MBR can remove viruses which infect the master boot sector but do not encrypt it. Using this command can produce unexpected results and cause unrecoverable damage.

File Viruses

File viruses usually replace or attach themselves to COM and EXE files. They can also infect files with the extensions SYS, DRV, BIN, OVL and OVY.

File viruses may be resident or non-resident, the most common being resident or TSR (terminate-and-stay-resident) viruses. Many non-resident viruses simply infect one or more files whenever an infected file runs.

Also: Parasitic Virus, Fire Infector, File Infecting Virus

Firewall

A firewall prevents computers on a network from communicating directly with external computer systems. A firewall typically consists of a computer that acts as a barrier through which all information passing between the networks and the external systems must travel. The firewall software analyzes information passing between the two and rejects it if it does not conform to pre-configured rules.

 

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