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WORM
It is not as harmful as Trojan Horse. It is a virus that simply
replicates itself. It also has the capacity to travel from one
computer system to another. Though it does not affect the
system immediately, but in the long run it takes over all the
computer system resources. Hence, the computer becomes
useless.

FILE INFECTOR
This virus adds a virus code to the regular
programming code within program files. It is the
common type of virus. When the regular infected
program files run, other program files also get
infected.

BOOT-SECTOR VIRUS
This virus attaches itself to the boot-sector of the disk. Bootsector
is the part of the disk where all the start-up instructions are kept.
This dangerous virus destroys this sector which is loaded into the
memory every time the disk is booted.

E-MAIL VIRUS
You use Internet to send and receive e-mails. E-mail viruses are
spread by files attached to e-mail messages. You cannot get an e-
mail virus from a message that does not contain any files that are
attached.

Memory Bytes

There is a virus known as Friday, the 13th Virus. It was first discovered at the
University of Jerusalem in 1987. Hence, it is also called as Jerusalem Virus. It gets
activated on the 13th of a month that comes on Friday.

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