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  1. 1. VIRUS ~ Presenters ~ Vincent Chong Kwan Tak Wai Chu Kean Chern
  2. 2. What is Virus • A computer virus is a program that can copy itself and infect the computer without the permission of the owner .
  3. 3. How viruses spread Viruses can be spread by : ~ Downloading a file which contains virus from the internet. ~ Receiving an email attachment that includes virus. ~ Opening a given website link from someone which is a virus website.
  4. 4. How virus avoids being detected Viruses can prevents being detected in many ways , the following is the main prevention method : ~ Encryption . Viruses use encryption to hide their identity . For example , you type the words “ABC” , then you encrypt the words you just typed , and then the words “ABC” will become fake words like “DEF”. (Also known as encrypted words)
  5. 5. Examples of Virus • Trojan Horse • Salami Attack These are 2 examples :
  6. 6. What is Trojan Horse • A trojan horse is a program that will do harm to the computer quietly. Example : You download a free online game and install it. When you are installing the game , the trojan also will be installed without your awareness. You play the game everyday , in the same time , the trojan will silently record the keys you have pressed while typing your password and send it to the creator of the trojan.
  7. 7. What is Salami Attack • Salami attack is a program that steals commission from someone without being noticed. Example : A bank worker insert a pen drive into a computer that controls all the account of every customer , then the pen drive starts to transfer a small amount of money from every customer’s account to the bank worker’s own account without the customer’s awareness.
  8. 8. Conclusion • Have at least one antivirus on your computer. • Always keep your antivirus updated. • Scan your computer through antivirus at least once a week.
  9. 9. References • • jan-HorseSalami-Attack