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

Stealth Viruses

There is a continual war between virus writers and anti-virus writers. As soon as new viruses are created, anti-virus software is created to neutralise and remove them. Virus writers have adopted various strategies to fool anti-virus software. One of the most popular and successful ways of fooling anti-virus software is to create a stealth virus.

Stealth viruses contain code that inserts itself between the operating system and the anti-virus software. Whenever a check is made for a virus, the stealth virus tells the operating system that there is no problem. In this way, the anti-virus software can be ignored and the virus can continue doing its work

Next: Virus Quiz 5