Video

1. Video Following is a video of what can happen if you don’t update your security settings!

2. Protecting Yourself in Cyberspace BBI 1OE

3. Viruses What are viruses? • Are programs that insert themselves into your computer • Are activated when you run an infected program or open a file • Immediately start to replicate themselves by looking for new areas to infect

4. Viruses Are all viruses the same? Boot-sector File Macro

5. Boot-Sector Viruses • Infect the boot sector of a computer’s disk or hard drive • It substitutes its code over code read by your computer when it is turned on or restarted • Forces the computer to read its code into memory and pass control to the virus code

6. Boot-Sector Viruses Brain Virus:a boot sector of storage media formatted with the DOS File Allocation Table • Created in Pakistan in 1986 • First known computer virus

7. File Viruses • Use a computer’s file system to propagate (grow and reproduce) • Work by infecting files when they are being opened, renamed, or saved • Cause messages to appear on screen

8. File Viruses Jerusalem Virus Dark Avenger Dir II

9. Macro Viruses • Programs written in macro languages (programming language) • Are designed to operate in specific software applications • Instructions attached to a document file that tell the software application to perform commands automatically • Propagate by transferring from one infected file to another • Common in programs like Microsoft Word, Excel and email applications

10. Macro Viruses Melissa Virus

11. Main Virus Infection Types • Worm – replicates itself and slithers through networks or email to infect computers • Are a malicious code that do not attach themselves to other files or programs • Trojans – a destructive program that pretends to be something else that users would want on their computer • Are also a form of malicious code (e.g. pretending to be virus protection software)

12. Main Virus Infection Types • Stealth – hides the modifications it has made to the files or boot records • Programs that try to read infected files may only see the original uninfected form • Polymorphic – produces slightly different copies of itself because it assumes the anti-virus software will not detect it • Armour – uses special tricks to make the tracing of its code more difficult

13. How Do Computers Catch a Virus? • Disks, CD-ROMs, and DVDs – leave an infected disk in the drive and restart • Internet & Email – files found on the Web can be infected and attached to emails • LANs – unless protected, virus can spread throughout the network • People – can program or save viruses on an unsuspecting computer

14. Protecting Against Viruses • Use anti-virus software and a firewall • Back up your files regularly • Protect your computer with a password • Lock your computer when it is not in use

15. Protecting Against Viruses • Firewall – software that prevents certain information from entering or leaving your computer when online • Anti-virus software scans your hard drive and other storage media to locate and destroy viruses • Scan all disks and removable storage with anti-virus software

16. Protecting Against Viruses • Encryption – encode information in a manner that only the person (or computer) with the key can decode it

17. It’s Viral! Your task: • Research 3 different types of anti-virus software that exist and what features they have • Research and briefly describe 5 of the worst computer viruses of all time