2. DEFINITION OF VIRUS
 A virus is an infectious program which
affects computer systems and data.
Viruses are spread to any other programs
they contact, thus being infectious. A virus
will attach a copy of itself to an executable
program.
 Usually attaches with .doc,.xls and exe
extensions

3. TYPES OF VIRUS
 Worm
 Trapdoor
 Backdoor
 Trojan Horse
 Salami Attack
 Logic Bomb
 Internet time theft

4. TROJAN HORSE
 A program in which malicious or harmful code
is contained inside apparently harmless
programming or data.
 The software initially appears to perform a
desirable function for the user prior to
installation and/or execution.Trojan Horse
attacks pose one of the most serious threats
to computer security.

5. TYPES OF TROJAN HORSE
 Remote Access Trojan
 Data Sending Trojan
 Proxy Trojan
 Destructive Trojan
 FTP Trojan
 Denial-of-service attack(DoS)

6. SALAMI ATTACK
 A salami attack is a series of minor data-
security attacks that together results in a
larger attack.
 Crimes involving salami attacks typically are
difficult to detect and trace.
 The salami technique can also refer to
aggregating small amounts of information
from many sources to derive an
overall picture of an
organization.

7. HOW TO COMBAT VIRUS
 Ensure that your operating system is up-
to-date.
 Have an antivirus installed on your system
and ensure you download updates
frequently to ensure your software has the
latest fixes for new viruses, worms, and
Trojan horses.
 Install a firewall to prevents unauthorized
use and access to your computer.

8. CONCLUSION
 Viruses are dangerous. You can maintain a
relatively safe computer with a little bit of
understanding and vigilance. Research any
new viruses you hear about to make sure that
the threat is real.

9. SOURCES
 http://www.support.psi.com/support/spart/virus.ht
ml
 http://www.webopedia.com/DidYouKnow/Internet/
2004/virus.asp
 http://virus-informati0n.blogspot.com/
 An Introduction To Keylogger, RATS And Malware
written by Rafay Baloch
 Teacher’s Handouts:Introduction to Information
and Communication Technology

10. Group Members:
Neville Quinn James(4F)
Muhd Saiful Nizam(4F)