The document outlines various types of computer viruses, including boot, program, macro, and polymorphic viruses, detailing their characteristics and how they propagate. It also discusses the role of antivirus programs in detecting, isolating, and removing these threats from computer systems. Additionally, it emphasizes the importance of keeping antivirus software updated to protect against new virus definitions.

1. • Yastee A. Shah
By:

4. Program/piece of code that is loaded
onto your computer without your
knowledge & runs against your
wishes.
Has ability to make copies by itself,
which attacks itself to other
applications and files.
All viruses are man-made.

5. There are many types of virus..
 Boot virus: Affects the boot sector of a floppy or hard disk
(crucial part where information on the disk itself is stored together
with a program that makes it possible to boot computer from the
disk.).
The best way of avoiding boot viruses is to ensure that floppy disks
are write-protected and never start your computer with an unknown
floppy disk in the disk drive.
Examples of boot viruses include: Polyboot.B, AntiEXE.


6.  Program Virus: Infects program files, with
extinction as .COM,.EXE,.DLL,.SYS,.SRC etc.
Program files are attractive targets because they
are widely used and have relatively simple
formats to which virus can attack themselves.
 Macro virus: Infect files that are created using
certain programs that contain macros. These
mini-programs make it possible to automate
series of operations so that they are performed as
a single action.
Examples of macro viruses: Relax, Melissa. A,
Babbles, O97M/Y2K.

7.  Directory virus
 Polymorphic virus
 Encrypted virus
 Stealth virus
 Worm
 Trojans
 Cookies etc.

8. Virus tries to take control of system it
has infected at the first opportunity
available.
It is linked to the host object in such a
way that it activates when host object is
used.
Then , virus looks for other suitable
carrier objects and attacks itself to them.
With this dependency, virus slows down
system.

9. Slow Down
The
Network
Hijack your
Computer
Delete
Data
Disable
Hardware
Corrupt
Data
Display
messages
Steal Data

10. Downloaded Programs
Cracked Software
Email Attachments
Internet
Booting from CD

11. ~Whether you saw a message saying a virus
was detected, or your computer just seems
slow and unreliable, you’ll want to scan for
malware on your PC and remove any you
find.

14. Computer program intended to identify
& eliminate computer virus.
Antivirus program runs in RAM of the
system.
There are mainly 2 types of anti-virus:
Specific.
Generic.

15. Antivirus application maintains
database of known virus & compare
scanned files that match
characteristics of known virus.
If scanned files matches those
characteristics of virus, it is moved to
separate place so that it cannot affect
other files on your system and can be
used if ever needed.

16. HOW DOES ANTIVIRUS
WORKS..

17.  Providing regular updates for virus
dictionary. Antivirus program should
provide free virus updates on periodic
basis.

20. https://www.microsoft.com/aspx
https://www.privacyrights.org/
http://www.webopedia.com/virus.html
http://www.avast.com/c-computer-virus
http:/google.com/