Madison Security Systems

Computer Viruses

Types of Viruses  Nuisance Viruses  Data-Destructive Viruses  Espionage Viruses  Hardware-Destructive Viruses

Methods of Operation  Viruses  Macro Viruses  Boot Sector Viruses  Trojan Horse Viruses  Stealth Viruses  Polymorphic Viruses  Logic (Time) Bombs

Virus Symptoms  Files become corrupt  Program does not operate properly  Programs or files vanish  Strange messages appear on monitor  Less memory or disk space available  A disk or volume name has changed  message appears repeatedly

Security Strategies  Data backup  Disaster recovery plan  Data encryption  User IDs and passwords  Biometric authentication  Network sniffers  Mini Webcams  Firewalls