Internet Safety: Viruses

Table of Contents

1. Introduction
2. Viruses, Trojans and Worms
3. Logic Bombs and Other Threats
   1. Virus Quiz 2
   2. Screen Savers
   3. Image Viruses
   4. Virus Quiz 3
   5. Macro Virus
   6. Resident Virus
   7. Virus Quiz 4
   8. Script Viruses (VBA, VBS, JS)
   9. Stealth Viruses
   10. Virus Quiz 5
   11. Mail Bombs
   12. Backdoors and Rootkits
   13. Virus Quiz 6
4. Example Viruses
5. Anti-Virus Software

Screen Savers

On a Microsoft Windows computer a .SCR file is a screen saver. As screen savers are just computer programs they are a useful way of inserting a virus into your computer. Typically SCR viruses come as an attachment to an e-mail. The text urges the recipient to click the attached file by promising perhaps a funny cartoon or enticing picture.

Once clicked the virus then installs itself onto your computer. As the SCR file pretends to be something else it is another example of a Trojan. Perhaps the most famous example of a SCR virus is the SOBIG worm, which installed software to send spam.

Next: Image Viruses