virus and antivirus

2. Contents:
 History of virus
 Computer Virus
 Action of Virus
 Types of Virus
 History of Anti-virus
 Anti-virus Software
 What to do on suspecting virus attack
 Types of Antivirus
 Action of Antivirus
 Working of Anti-Virus
 General precautions

3. History of Virus
 The term ``computer virus'' was formally defined by Fred Cohen in
1983, while he performed academic experiments on a Digital
Equipment Corporation VAX(virtual address extension) system.
 The first computer viruses were developed in the early 1980s.
 The first viruses found in the wild were Apple II viruses, such as Elk
Cloner, which was reported in 1981.

4. Virus
 Virus (Vital information Resource Under Seize )
 It is a software use to infect a computer. After virus is written it is
integrated with in an essential programmed.
 Once the programmed is executed the virus code is activated and
attacks copies of itself to other programs.
 A common type virus is a boot virus which is stored in the boot
sector of disk if the disk is left in the drive when the machine is
infected with FLOPPY , CD, hard disk expecting to the find the
operating there once the machine is effected the boot virus may
replicate it self on to all the floppies.

6. What is computer virus?
 Computer virus is nothing but a computer program that can infect
a computer without the knowledge of the person using the system.
 Virus can spread from one system to another when a infected file is
copied or transfer from host to target system.

7. Action of virus on computer
 Any unwanted activity on the computer is treated as virus/worm
.In actual there are programs and codes written by some computer.
 Virus can cause on computer such as:
1. It may take space on Hard Disk.
2. Opening some programs.
3. Generating some messages.
4. Slow down the computer.
5. Delete your valuable data.
6. Unwanted activity over screen .
7. Crash the hard disk.
8. Unable to boot.

8. Types of viruses
1. Direct Action Virus:
The main purpose
of this virus is to
replicate and take
action when it is
executed.
2. Resident viruses:
This type of virus
Is a permanent which
dwells in the RAM memory.

9. 3. Overwrite virus:
 virus of this kind is characterized by the fact that it deletes the
information contained in the files that it infects , rendering them
partially or totally.
 The only way to clean a file infected by an overwrite virus is to
delete the file completely , thus losing the original content.

10. 4. Directory virus:
1. Computer virus:
A computer virus attached itself to a program or file enabling it to
spread from one computer to another , leaving infections as it travels
like a human virus.
1.It effects while others can damage your HARDWARE ,
SOFTWARE , or files. Almost all viruses are attached to an
executable file ,which means the viruses may exist on your computer
unless you run.
2.It is important to note that a virus cannot be spread without a human
action to keep it going.
3. People continue the spread of a computer virus , mostly
unknowingly , by sharing infected files e-mail with viruses as
attachment in the e-mail.

12. 2. Worm:
 A worm is similar to a virus and considered to b a sub –class of a
virus . Worms spread from computer to computer , but unlike a
virus , it has the capability to travel without any human action.
 The biggest danger with a worm is its capability to replicate itself
on your system , so rather than your computer sending out a single
worm , it could send out hundred or thousand of copies of itself ,
creating a huge devastating effect.
 Due to the copying nature of a worm and its capability to travel
across networks the end result in most cases is that the worm
consume too much system memory causing web servers , and
individual computers to stop responding.

14. 3. Trojan Horse:
 When a Trojan is activated on your computer , the result can vary.
 Some Trojans are designed to be more annoying than malicious or
they can cause serious damage by deleting files and destroying
information on your system.
 Unlike viruses and worms , Trojans do not reproduce by infecting
other files nor do they self-replicate.
 Latest virus:
Name Type Risk Data Discovers
1. RDN/Generic.bfr!6CCE1B5B719E TROJEN 2/10/2014
2. RDN/Generic.bfr!D5770181F03E TROJEN 2/10/2014

16.  Fred Cohen, who published one of the first academic papers on
computer viruses in 1984,began to develop strategies for antivirus
software in 1988 that were picked up and continued by later
antivirus software developers. In 1987, he published a
demonstration that there is no algorithm that can perfectly detect all
possible viruses.
 In 1987 the first two Heuristic antivirus utilities were released:
Flushot Plus by Ross Greenberg and Anti4us by Erwin Lanting.
History of Antivirus

17. Antivirus software
 An antivirus is a computer program that identify and remove
computer viruses and other malicious like worms and Trojans form
an infected computer. Not only this , antivirus software also
protects the computer from further virus attacks.

19. What to do on suspecting virus attack
 Disconnect the suspected computer system from the internet as
well as from the local network.
 Start the system in safe mode or from the windows boot disk , if it
display any problem in starting .
 Take backup of all data to an external drive.
 Install antivirus software if you do not have it installed .
 Now , download the latest virus definition update from the internet
(do it on a separate system).
 Perform a full system scan.

20.  Shield Deluxe – Anti-virus & Antispyware
 Spyware Doctor & Antivirus
 F pront Antivirus
 Bit Defender Antivirus Plus
 Ashampo Antivirus

21. 1. Shield Deluxe – Antivirus &
Antispyware
 The shield Deluxe 2009 , powered by Bit Defender award winning
Antivirus engine . It provides advanced proactive protection against
viruses , Spyware attack and identity theft.
 Stay one step ahead of the latest e – Threats while maintaining superior
performance that keeps your PC running smoothly.
 The shield Deluxe is simple to install and set up , while offering
advanced users a range of versatile settings for fine – tuning the
program.
 $29.99 to register

22. 2. Spyware Doctor & Antivirus
 Award – Winning spyware and virus protection to secure your PC.
 Spyware Doctor with Antivirus is a top-rated malware , spyware &
virus removal utility that detects , removes and protects your PC
from thousand of potential spyware , adware , Trojans , viruses ,
key loggers , spybots and tracking threats.

23. 3. F Pront Antivirus
 Tired of clunky AV program the slow down your computer and
constantly interfere with your work or when you send email ?
 F –PROT Antivirus for windows is legendary for their high
security , streamlined efficiency and very low resource
consumption F – PROT for windows runs as good on win XP pro
as it does on Win -98 .
 Many millions have chosen F-PROT world wide.
 F-PROT will keep your computer secure and keep out of your way.

24.  New Bit Defender Antivirus Plus v 10 intergrates
ANTIVIRUS , ANTISPYWARE , FIREWALL , and
ANTISPAM modules into one comprehensive security
package that protect your personal computer.

25. 5. Ashampo Antivirus:
 Ashampoo Antivirus gives you comprehensive protection against
viruses , worms , Trojans and dialers , but it s so efficient you won
even notice its there
 And its so easy to use that it wont waste any of your valuable time.
Just set it and forget it and get on with more important things.

26. Anti-virus Action:
1. Attempts to repair the file by removing the virus itself from the
file.
1. Quarantine the file (such that the file remains inaccessible to other
program & it s virus can no longer spread )
2. The antivirus software examine each & every file in a computer &
examines the contain with the virus definition if threat is found
then delete the infected file.

27. Working of Anti-Virus

28. General precautions:
 When inserted removable media (floppy drive etc.)
scan the whole device with the antivirus software before opening it.
 If you have internet access , make sure you use internet security
Software.
 Get windows updates.
 Form time to time , update your installed software to their latest
version . (MS office , java , flash player etc. )
 You should have an update antivirus guarding your PC all time.