COURSE: Enthical And Social Issues In Information System

1. COURSE: Enthical And Social Issues In Information System Name: Perpetual IfeanyiOnyia Topic: Virus, Worms, & Trojan Horses

2. Virus, worms, & Trojan Horses • They are all malicious program that can cause damage to your computer. But there are differences among the three. One common mistake people make when the topic of a computer virus arises is to refer to a worm or trojan horses as a virus.

4. Creation Of Virus: • Few years ago, creating a virus required knowledge of a computer programming language. Today anyone with even a little programming knowledge can create a virus.

5. First Computer Virus: • The creeper virus was first detected on ARPANET, the forerunner of the internet, in the early 1970. Creeper was an experimental self-replicating program written by Bob Thomas at BBN technologies in 1971.

6. Virus • virus is a program that can infect other program by modifying it, virus attaches itself to a program or files enabling it to spread from one computer to another leaving infection as it travels. Virus is a malicious program that is a fragment of an executable program. When a system is infected the disk operating system can be temporarily controlled by the virus to infect the other files. Virus can be activated when the host program is activated to perform a specific task. People continue the spread of virus mostly unknowingly by sharing the infecting files or sending e-mail with viruses as attachment in the e-mail.

7. The Life Phase Of A Virus: • Dormant Phase • Propagatory Phase • Triggering Phase • Execution Phase

8. Types of virus • Parasitic Virus • Memory-Resident Virus • Boost Sector Virus • Macro Virus

9. Parasitic Virus • It is the most common form of virus. • Memory-Resident Virus: these virus stays in the main memory and infect every program that execute. • Boost Sector Virus: it infects a master boot record and spread when a system is boosted from the disk containing virus. • Macro Virus: these is a form of virus that does not infect executable files or program.

10. Worm • Worms is a program or algorithm that replicates itself over a computer network and usually perform malicious action. Network worms uses network connection to spread from system to system. once active within a system, it can behave as a computer virus or bacteria or could implant trojan horses or perform any number of destructive action.

11. Worms:

12. Trojan Horses • Trojan horses is a useful program or command procedure containing hidden code that when invoked can perform some unwanted or harmful function. Trojan horses first glance will appear to be useful software but will actually do damage once installed or run on your computer. When a trojan horse is activated on your computer the results can vary.

13. Trojan Horses:

14. Ways To Prevent Viruses, Worms, & Trojan Horses On your Computer • Keep the operating system of your computer updated. • Have anti-virus software • Use a firewall

15. Summary: • When a virus or worms is activated, they are trying to produce one or more copies of itself to be activated later on the same system or some other system. • Virus, worms and trojan horses are all malicious program.

16. Thanks