Read the text and get the main information

A computer virus

A computer virus is a program which reproduces itself. It may attach to other programs, it may create copies of itself (as in companion viruses). It may damage or corrupt data, change data, or degrade the performance of your system by utilizing resources such as memory or disk space.

A computer virus may be categorized with one or more of the following four designations:

• Boot sector computer virus

• Master Boot Record (MBR) computer virus

• File infector computer virus

• Macro computer virus

A computer virus which displays characteristics of more than one of these categories is known as a multi-partite computer virus.

Boot sector viruses

Boot sector viruses infect the boot record on hard disks, floppy disks, and theoretically also on CD's and DVD's.

Once the infected computer does successfully boot, the boot sector virus stays in memory and infects floppies and other media when they are written to by the infected computer.

Master Boot Record (MBR) viruses

Master Boot Record (MBR) viruses are very similar to boot sector viruses, except that they infect the MBR (Master Boot Record) instead of the boot sector.

File infector viruses

File infector viruses infect files which contain executables code, such as.EXE and.COM files.

Macro viruses

Macro viruses infect certain types of data files. Most macro viruses infect Microsoft Office files(such as Word Documents, Excel Spreadsheets, PowerPoint Presentations, and Access Databases)

Дата добавления: 2015-08-27