this ppt base on computer virus

3. Group members
 Vidyash .B (co-presenter)
 Rohit .M (helper)
 Hrishikesh . W (Leader)
 Nishant .R (Editor)
 Saklen.A
 Sreyash G

4. Virus Founder
 The first computer virus popularly known
as the 'Brain virus' was created in 1986
by two Pakistani brothers Amjad and
Basit Farooq Alvi

5. Types Of Computer Viruses.
Computer viruses can be classified into
various categories , as listed here.
Boot Sector Virus
Program Virus
Stealth Virus
Multipartite Virus
Macro Virus

6. Virus types

7. What is a computer virus ?
 A computer virus is a malware program that, when
executed, replicates by inserting copies of itself (possibly modified)
into other computer programs, data files, or the boot sector of
the hard drive; when this replication succeeds, the affected areas
are then said to be "infected".[1][2][3][4]Viruses often perform some
type of harmful activity on infected hosts, such as stealing hard
disk space or CPU time, accessing private information, corrupting
data, displaying political or humorous messages on the user's
screen, spamming their contacts, logging their keystrokes, or even
rendering the computer useless. However, not all viruses carry a
destructive payload or attempt to hide themselves—the defining
characteristic of viruses is that they are self-replicating computer
programs which install themselves without user consent.

8. What a Computer virus
does
 A computer virus might corrupt or
delete data on your computer, use
your email program to spread itself to
other computers, or even erase
everything on your hard
disk. Computer viruses are often
spread by attachments in email
messages or instant messaging
messages

9. How a computer virus spreads
 Computer
viruses usually spread in
one of three ways: from
removable media; from
downloads off the Internet;
and from e-mail attachments.
Although the Internet gets a
bad rap as a source
of viruses, you're no more
likely to contract a virus from
the Web than you are from
packaged software

10. Types of computer virus
 Boot Sector Virus
 Program Virus
 Stealth Virus
 Multipartite Virus
 Macro Virus

11.  Boot-sector viruses infect computer
systems by copying code either to the boot
sector on a floppy disk or the partition table
on a hard disk. During startup, the virus is
loaded into memory. Once in memory, the
virus will infect any non-infected disks
accessed by the system

12.  A computer virus is a
malware program that, when executed,
replicates by inserting copies of itself
(possibly modified) into other computer
programs, data files, or the boot sector of
the hard drive; when this replication
succeeds, the affected areas are then said to
be "infected"

13.  In computer security, a stealth virus is a
computer virus that uses various
mechanisms to avoid detection by
antivirus softwareA stealth virus is
complex malware that hides itself after
infecting a computer. Once hidden, it
copies information from uninfected data
onto itself and ..

14.  A multipartite virus is a computer virus that
infects and spreads in multiple ways. The
term was coined to describe the
first viruses that included DOS executable
files and PC BIOS boot sector virus code,
where both parts are viral themselves

15. WORMS
 A computer worm is a
standalone malware computer
program that replicates itself in
order to spread to other
computers.[1] Often, it uses
a computer network to spread
itself, relying on security failures
on the target computer to access
it. Unlike a computer virus, it does
not need to attach itself to an
existing program.[2] Worms almost
always cause at least some harm
to the network, even if only by
consuming bandwidth, whereas
viruses almost always corrupt or
modify files on a targeted
computer

16. TROJAN HORSE
 A Trojan horse, or Trojan,
in computing is
any malicious computer
program which
misrepresents itself as
useful, routine, or
interesting in order to
persuade a victim to install
it. The term is derived from
the Ancient Greek story of
the wooden horse.[1][2][3][4][5]

17. PREVENTING VIRUS
INFECTION
A computer virus is program code which 'hides' in
other files and can cause irreparable damage
to your computer. Computer viruses spread
easily between computers when people pass
files to each other Virus Checkers (software
programs) provide protection against viruses,
new and old. However, virus writers are all too
ingenious and for every block that the virus
protection developers put in place, virus writers
are devising new code to create nuisance. This
user guide provides you with information about
the steps you can take to reduce the likelihood
of your computer getting infected with a virus.

18. ANIT – VIRUS SOFTWARE
 You should always ensure that
you have an anti-virus software
installed and enabled on your
computer. This type of software
can detect and block viruses
before they have a chance to
cause any harm. A good anti-
virus program can scan for
viruses on your hard drive or any
program, files, or documents. If it
finds any viruses, it can remove
the virus, quarantine it or delete
the file safely from your
computer.

19. Worlds best anti – virus of 2015
 VIPRE 1 ST
 ESET 2th
 AVG 3th
 AVIRA4th
 NORTON 5th
 KASPERSKY 6th
BITDEFENDER7TH
AVAST 8TH
MCAFEE9TH
PANDA 10TH

20. NORTON ANTIVIRUS
(NAV)
 Norton anti virus (NAV)is product of Symantec
corporation and is one of the most widely used
anti-virus programs . Using Norton Antivirus
,you can scan files .folder or entire drive for
viruses if any type of computer threat is found
on a computer theft is found on a computer
system, this anti-virus software removes it and
disassociates its action. Norton anti –virus
software removes viruses, Trojan horses and
worms from a computer system it also checks
incoming and out coming e-mail attachments
for viruses

21. Scanning and removing
 To find and remove viruses
(if any)from your computer
using Norton anti virus
,follow these steps
1. Start the Norton anti virus
program from the start
menu.
OR
Double click the icon ( ) on
the Destop,the Norton Anti
Virus main windows appear

22. 2. Select the scan for viruses option to start the
virus check The scan For Viruses windows
appears

23. 3. If you choose to scan My computer, all the removable
drives or all the floppy disks, the scanning
Start automatically. If you choose to
scan drive , folders or files, dialog box appears in which
choose the drives , folders or files to scan . the various
scanning options and their functions are discussed in table
6.1
Scanning option function
Scan my computer Checks all boot records and
files on a computer
Scan all removable drives Checks all the removable
drives like floppy drives CD
drives, etc
Scan all floppy disks Checks all floppy disks
Scan drives Checks the selected hard
disk and / or removable
drive
Scan folder Checks the selected folder
Scan files

24. Select any one of
the given options
to launch a scan .
For example to
scan a folder on
hand disk for
viruses, click the
Scan Folders
dialog box appear

25. 4. Select the folder and click
Scan .the
Scanning process starts and
the scan process starts
and the scan
Progress window displays the
status of
The scan.

26. 5.If a virus is found ,a
norton ANtiVirus
alert appears on the
scrren giving the
information about
the virus
6. After the scanning
is completed ,
Norton Anti-virus
displays a summary
of the scan.
7.Click Finished to
close the main
windows

27. Repair Wizard
 After antivirus defects the virus , it can
 Remove the virus in any of this three
different ways
• Fixing the infected file: this deletes the
virus and repairs the infected file .It is
the best way to remove a virus.
• Deleting the infected file: this delected
both t he virus and the infected file. If
norton anti-virus program cannot repair
the infected

28. 1. What is mean by the anti-virus ?
 The software which is use for the
deleting the virus
 The software which is use for the insert
the virus