fully concept related to virus and some special type of viruses

1. “COMPUTER VIRUS”

2. WHAT ARE COMPUTER VIRUS? ? ?
 A computer virus is a type of malicious
code or program written to alter the way
a computer operates and that is
designed to spread from one computer
to another. A virus operates by inserting
or attaching itself to a legitimate
program or document that supports
macros in order to execute its code.

3. WHAT IS COMPUTER VIRUS? ? ? (Conti.)
 In the process a virus has the potential
to cause unexpected or damaging
effects, such as harming the system
software by corrupting or destroying
data.

4. SOME OF THE viruses :-
1.) ILOVEU:- The ILOVEYOU virus is considered one of
the most virulent computer virus ever created and it’s not hard
to see. causing damages totaling in at an estimate of $10 billion.
10% of the world’s Internet-connected computers were believed to
have been infected. It was so bad that governments and large
corporations took their mailing system offline to prevent infection.

5. Cont…
2.) SASSER :- A Windows worm first discovered in 2004,
it was created by computer science student Sven Jaschan, who
also created the Netsky worm. it slows down and crashes the
computer, while making it hard to reset without cutting the power.
This led to more than a million infections, taking out critical
infrastructures, such as airlines, news agencies, public
transportation, hospitals, public transport, etc. Overall, the damage
was estimated to have cost $18 billion.. Jaschen was tried as
a minor and received a 21 month suspended sentence.

6. Cont…
3.) ZEUS :- Zeus is a Trojan horse made to infect Windows
computers so that it will perform various criminal tasks. The most
common of these tasks are usually man in the browser key
logging and form grabbing. It managed to compromise thousands
of FTP accounts and computers from large multinational
corporations and banks such as Amazon, Oracle, Bank of
America, Cisco, etc. Controllers of the Zeus botnet used it to steal
the login credentials of social network, email and banking accounts.

7. Cont…
4.) MYDOOM :- Surfacing in 2004, Mydoom was a worm for
Windows that became one of the fastest spreading email worm.
The author is unknown and it is believed that the creator was paid
to create it since it contains the text message, “andy; I’m just doing
my job, nothing personal, sorry,”. The worm spreads itself by
appearing as an email transmission error and contains an
attachment of itself. It was believed that the worm was created
to disrupt SCO due to conflict over ownership of some Linux code.
It caused an estimate of $38.5 billion in damages and the worm is
still active in some form today.

8. Where DOES VIRUS ATTACKS OUR SYSTEM? ? ?
 Once a computer virus has infected your
system, it can rapidly spread through
other programs and begin affecting your
computer's operating system and your
valuable data. A computer virus is
designed to self-replicate, self-install,
and attack the root functions of various
programs without authorization or the
user’s knowledge.

9. Where DOES VIRUS ATTACKS OUR SYSTEM? ? ? (cont…)
 Viruses commonly infect executable programs or
those programs where files are used to start up
and launch other computer programs. Since these
are executed upon each start up session, the virus
can spread quickly and grow in size over a very
short period of time.

10. VIRUS ATTACK :-

11. SOURCE OF VIRUSES ? ? ?
1.) Email and text message attachments,
2.) Internet file downloads,
3.) Social media scam links,
4.) Connecting devices that are not
protected/scanned
(such as pendrives,HDD,smartphones,etc…),
5.) File sharing apps.

12. How to protect our system ? ? ?
1.) Keep your software up-to-date,
2.) Use a hardware-based firewall,
3.) Don't click on email links or attachments,
4.) Install quality antivirus,
5.) Perform daily scans.

13. Some of the anti-viruses…
1. Quick Heal
2. avast
3. KaSperSkY
4. Norton
5. PANDA
6. es-et
7. webroot