CSCS 100

Shamoon Bashir15-10317

Joshua Siddqui15-10899

Topic

Content Presentation Contains• Definition of Virus• Basic Computer Viruses Basic Computer Viruses • There FunctionThere Function• How to PreventHow to Prevent• There PurposeThere Purpose• Some History Some History

DO YOU HAVE A VIRUS?

What is a virus?

A virus is illegal computer code that can destroy data.

COMPUTER VIRUS:

Computer Virus:

A software program capable of reproducing itself and usually capable of causing great harm to files or other programs on the same computer.

Basic Computer Viruses Basic Computer Viruses

Trojan HorsesTrojan HorsesAppears as interesting program file but when Appears as interesting program file but when

installed it allows intruders to access and read your installed it allows intruders to access and read your files.files.

WormsWormsVirus that copies and multiplies itself by using Virus that copies and multiplies itself by using

computer networks and secure flaws.computer networks and secure flaws.

E-mail VirusesE-mail VirusesUse e-mail messages to spread which allow it Use e-mail messages to spread which allow it

to automatically forward itself to thousands of peopleto automatically forward itself to thousands of people

How do viruses spread?

Viruses can spread through Email Attachments Application programs on your computer

Signs Your Computer is Signs Your Computer is InfectedInfected

•Functions slower than normalFunctions slower than normal

•Responds slowly and freezes oftenResponds slowly and freezes often

•Restarts itself oftenRestarts itself often

•Notice applications fail to work correctlyNotice applications fail to work correctly

•Fail to print correctlyFail to print correctly

When does a virus attack?

A virus usually attacks at the specific times or dates determined by the person who wrote the virus code. When the predetermined time or date registers on the internal clock of the computer, the virus attacks. Sometimes the virus code will leave a message letting you know that the virus has done its damage.

Helpful Hints to Avoid Viruses

Obtain software only from trusted sources. Use a safe Web browser and e-mail client. Install anti-virus software, and keep it update. Scan all newly-obtained disks, programs, and

files. Install a firewall program, especially if on cable

or DSL.

Some popular anti-virus programs:

McAfeeNorton UtilitiesInoculanF-SecureInternet Guard DogPC-cillin

Why do People Create Computer Viruses?

To take control of a computer and use it for specific tasksTo generate moneyTo steal sensitive information (credit card numbers, passwords, personal details, data etc.)To cripple a computer or network

When was first virus created

The first virus was made in Chauburji, Lahore, Pakistan, 1986

Two programmers named Basit and Amjad Farooq Alvi

“Brain” was the name of that virus.