Page 70 - TP_Pluse_V2.2_Class_6
P. 70

Boot Sector Virus

                  A Boot sector virus is one of the most hostile types of computer viruses that infects the boot sector
                  or the Master Boot Record (MBR) of hard disks. Once a computer system is infected by a boot sector
                  virus, any disk connected to the computer will also be infected. The most commonly known boot
                  sector viruses are Michelangelo and Stoned.

                  Macro Virus


                  A  macro virus is a type  of computer  virus that  is primarily  designed  to  infect  a specific  type  of
                  documents such as Word or Excel files. If we open a macro virus infected document, the macro virus
                  gets active into the memory and starts infecting other documents. Sometime, a macro virus sends
                  itself by attaching with e-mail to the people in the user's address book. Melissa and Bablas are the
                  most commonly known macro viruses.

                  E-mail Virus

                  An E-mail virus is a type of computer virus that transmit from one computer to other through
                  e-mail messages. Some e-mail viruses can also be transmitted as an infected attachment with
                  the e-mail message. It gets active into the memory when a user opens an infected e-mail or
                  attachment. It sounds very simple but an e-mail virus can erase files, destroy information and

                  cause computer crashes.


                       How does a Computer get infected with Virus?
                  Computer viruses spread through several ways. Some of them are:

                      Using virus infected CDs/Pen Drives.

                      Opening an infected e-mail attachment.
                      Downloading an infected program from Internet, Pen Drives, CDs or DVDs.

                      Running an infected program (which can be a game, screen saver, etc.)

                      Through local computer networks.











                                     CD                              Pendrive                      E-mail

                       How Do You Know Your PC has a Virus?


                  An infected computer system will:
                      start displaying unusual messages on the screen.
                      load the programs late.


                  68    Plus (Ver. 2.2)-VI
   65   66   67   68   69   70   71   72   73   74   75