Software that is intentionally inserted into a system for a harmful purpose is a malicious software. While a piece of software that that can infect other programs by modifying them is called a worm .

Malicious Programs can be divided into two categories:
  1. Host Dependant




  • Backdoor
  • Logic Bomb
  • Trojan Horses
  • Virus

2. Host Independent
  • Worms
  • Zombie

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