The document is a presentation on computer viruses and anti-virus software. It begins with an introduction and then covers topics such as what computer viruses are, how they spread and different types. It also discusses the history of viruses, why people create them, signs of infection and how anti-virus software works to detect and remove viruses. Finally, it provides tips on protecting systems from viruses such as installing anti-virus software and regularly updating it.

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Presentation on Virus and
Anti-virus
N ame :
R oll no :
D epart ment :

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ACKNOWLEDGEMENT

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• I N T R O D U C T I O N
• W H AT A C O M P U T E R V I R U S D O ?
• H I S T O R Y O F C O M P U T E R V I R U S
• W H Y D O P E O P L E C R E AT E C O M P U T E R V I R U S ?
• H O W D O C O M P U T E R V I R U S S P R E A D ?
• S I G N S O F A V I R U S I N C O M P U T E R
• T Y P E S O F C O M P U T E R V I R U S
• W H AT I S A N T I - V I R U S ?
• H O W A N A N T I - V I R U S W O R K S ?
• H O W T O P R O T E C T Y O U R S Y S T E M A G A I N S T V I R U S ?
Content

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• What is Computer Virus ?
A c omputer virus is a type of malic ious
s oftw ar e , or malw ar e , that s pr eads betw een
c omputer s and c aus es damage to data and
s oftw ar e .
INTRODUCTION

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• A vir us tr ies to tak e c ontr ol of c omputer s ys tem
at the fir s t oppor tunity available.
• Als o it mak es c opies of it s elf and tr y to c ar r y
har mful tas k w r itten in its pr ogr am.
• This pr oc es s c an happen s o quic k ly that the
us er is not even aw ar e of the pr es enc e of a
vir us in c omputer.
WHAT A COMPUTER VIRUS DO ?

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• T h e f i r s t c o m p u t e r v i r u s , c a l l e d " C r e e p e r s y s t e m " ,
wa s a n e x p e r i m e n t a l s e l f - r e p l i c a t i n g v i r u s r e l e a s e d
i n 1 9 7 1 . I t wa s f i l l i n g u p t h e h a r d d r i v e u n t i l a
c o m p u t e r c o u l d n o t o p e r a t e a n y f u r t h e r. T h i s v i r u s
wa s c r e a t e d b y B B N t e c h n o l o g i e s i n t h e U S .
• T h e f i r s t c o m p u t e r v i r u s f o r M S - D O S wa s " B r a i n "
a n d wa s r e l e a s e d i n 1 9 8 6 . I t wo u l d o v e r wr i t e t h e
b o o t s e c t o r o n t h e f l o p p y d i s k a n d p r e v e n t t h e
c o m p u t e r f r o m b o o t i n g .
• " T h e M o r r i s " wa s t h e f i r s t C o m p u t e r v i r u s wh i c h
s p r e a d e x t e n s i v e l y i n t h e wi l d i n 1 9 8 8 . I t wa s
wr i t t e n b y R o b e r t M o r r i s .
HISTORY OF COMPUTER VIRUS

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• To d e s t r o y s o m e o n e ’s c o m p u t e r, s o m e v i r u s e s
a r e m a d e o n l y t o d e s t r o y wi t h n o r e wa r d
i n v o l v e d m o n e y wi s e .
• To t a k e c o n t r o l o f a S y s t e m a n d u s e i t f o r
s p e c i f i c t a s k s .
• To s t e a l s e n s i t i v e i n f o r m a t i o n ( C r e d i t c a r d
d e t a i l s , P a s s wo r d , P e r s o n a l d a t a e t c . ) .
• To t e s t s e c u r i t y, s o m e p e o p l e c r e a t e v e r y s i m p l e
v i r u s e s t o m a k e s u r e y o u r a n t i v i r u s wo r k s .
WHY DO PEOPLE CREATE COMPUTER VIRUS ?

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• Computer virus es us ually s pread in one of three
w ays :
 Removable media.
 Downloads off the Internet;
 E-mail attachments.
HOW DO COMPUTER VIRUS SPREAD ?

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• F r e q u e n t c r a s h e s . A v i r u s c a n i n f l i c t m a j o r d a m a g e o n
y o u r h a r d d r i v e . T h i s m a y c a u s e y o u r d e v i c e t o f r e e z e o r
c r a s h . I t m a y a l s o p r e v e n t y o u r d e v i c e f r o m c o m i n g b a c k
o n .
• U n u s u a l l y s l o w c o m p u t e r p e r f o r m a n c e . A s u d d e n c h a n g e
o f p r o c e s s i n g s p e e d c o u l d s i g n a l t h a t y o u r c o m p u t e r h a s
a v i r u s .
• U n k n o w n p r o g r a m s t h a t s t a r t u p w h e n y o u t u r n o n y o u r
c o m p u t e r
• F r e q u e n t p o p - u p w i n d o w s .
• M a s s e m a i l s b e i n g s e n t f r o m y o u r e m a i l a c c o u n t .
SIGNS OF A VIRUS IN COMPUTER

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1 . Boot s ec tor vir u s
2 . Web s c r ipting vir us
3 . Br ow s er hijac k er
4 . R es ident vir us
5. Direc t ac tion virus
6 . Polymor phic vir us
7 . File infec tor vir us
8 . Multipar tite vir us
9 . Mac r o vir us
TYPES OF COMPUTER VIRUS

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• A n t i v i r u s s o f t wa r e i s a p r o g r a m t h a t a r e d e s i g n e d t o
p r e v e n t , s e a r c h f o r, d e t e c t , a n d r e m o v e s o f t wa r e
v i r u s e s . O n c e i n s t a l l e d , m o s t a n t i v i r u s s o f t wa r e r u n s
a u t o m a t i c a l l y i n t h e b a c k g r o u n d t o p r o v i d e r e a l - t i m e
p r o t e c t i o n a g a i n s t v i r u s a t t a c k s .
• E x a m p l e : N o r t o n , Q u i c k H e a l , AV G e t c .
WHAT IS ANTI-VIRUS?

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• T h e a n t i v i r u s s o f t wa r e e x a m i n e s e a c h a n d e v e r y f i l e
i n a c o m p u t e r a n d e x a m i n e s i t s c o n t e n t wi t h t h e
v i r u s d e f i n i t i o n s s t o r e d i n i t s v i r u s d i c t i o n a r y.
• A v i r u s d i c t i o n a r y i s a n i n b u i l t f i l e b e l o n g i n g t o a n
a n t i v i r u s s o f t wa r e t h a t c o n t a i n s c o d e i d e n t i f i e d a s a
v i r u s b y t h e a n t i v i r u s a u t h o r s .
HOW AN ANTI-VIRUS WORKS?
VIRUS
Found!

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 I n s t a l l a g o o d a n t i v i r u s s o f t w a r e o n y o u r s y s t e m .
 U p d a t e y o u r a n t i v i r u s r e g u l a r l y.
 B e c a r e f u l w h i l e d o w n l o a d i n g f i l e s o r p r o g r a m s f r o m t h e
w e b .
 A l w a y s s c a n y o u r r e m o v a b l e d e v i c e s ( C D , P e n d r i v e e t c . ) .
 D o n o t u s e p i r a t e d o r c r a c k e d s o f t w a r e .
 A l w a y s t u r n o n f i r e w a l l o f y o u r o p e r a t i n g s y s t e m .
HOW TO PROTECT YOUR SYSTEM AGAINST
VIRUS ?

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• h t t p s : / / u s . n o r t o n . c o m / i n t e r n e t s e c u r i t y - m a l w a r e - w h a t - i s - a -
c o m p u t e r - v i r u s . h t m l
• h t t p s : / / w w w. w e b r o o t . c o m / i n / e n / r e s o u r c e s / t i p s -
a r t i c l e s / w h a t - i s - a n t i - v i r u s - s o f t w a r e
• h t t p s : / / e n . w i k i p e d i a . o r g / w i k i / A n t i v i r u s _ s o f t w a r e
• h t t p s : / / w w w. f o r t i n e t . c o m / r e s o u r c e s / c y b e r g l o s s a r y / c o m p u t
e r - v i r u s
BIBLIOGRAPHY

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Safe Computing