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Computer Virus
- 2. Table of Contents 1) Objectives 2) What is Virus? 3) Uses of Virus 4) Types of Virus 5) Lifecycle of Virus 6) Removal of Virus from a computer 7) Prevention from Virus 8) Conclusion 9) Reference 10) Queries (3) (4) (5) (8) (14) (16) (17) (18) (19)
- 3. Objectives To know the uses of virus. To protect and prevent yourself from virus. To know process of getting your computer free from virus.
- 4. What actually is virus? 1. Small software designed to interfere with victim’s computer operation. 2. Ability of self-replication. 3. Loaded and run without user’s consent. 4. CODED BY PROGRAMMERS.
- 5. Why virus is called ‘virus’? SIMILARITIES BETWEEN BIOLOGICAL VIRUS AND COMPUTER VIRUS 1. Need a host as a place of residence. 2. Destroy host gradually without any knowledge. 3. Ability of self replicate.
- 6. Uses of Virus To run legal programs. To protect own computer from hackers. Making tasks easy for user.
- 7. Why people create Virus? 1. Stealing valuable data and information. 2. Get access to victim’s computer in order to spy. 3. Pranks and jokes.
- 8. Types of Virus Virus Worms Trojan Horses
- 9. Types of Virus (Contd). 1. Virus
- 10. Types of Virus (Contd). 2. Worms
- 11. Types of Virus (Contd). 3. Trojan Horses.
- 12. The virus waits until user transmits the infected object to another computer User transmits an infected object to another computer The virus locates and infects suitable objects on the new computer
- 13. PC - 4 PC - 2 PC - 3 PC - 4 PC - 7PC - 5 PC - 6 PC - 1PC - 1 PC - 2 PC - 3 PC - 4 PC - 5 PC - 6 PC - 7 Infection of Virus in Computer network
- 15. Detection of Virus Some Symptoms: Program takes longer to load. The program size keeps changing. The drive light keeps flashing when you are not doing anything. User created files have strange names.
- 16. Removal of Virus Scan your computer time-to-time. Use Windows Defender and make sure to update it regularly. Use online scanning tools like Microsoft Safety Scanner.
- 17. Prevention from Virus Never open unusual or spam e-mails. Always back up hard drive data. Create system restore points regularly. Download required software or any data from trustable websites only.
- 18. Conclusion Knowing what viruses are. Being aware about virus attacks. Always give first priority to safety.
- 19. Reference http://www.webopedia.com/DidYouKnow/Internet /2004/virus.asp - The Difference Between a Virus, Worm, and Trojan Horse. http://en.wikipedia.org/wiki/Computer_virus - Computer Virus http://www.microsoft.com/protect/computer/basics /virus.mspx - What is Computer Viruses http://www.soe.umich.edu/computingnetwork/howt o/avoidviruses - How To Avoid Computer Viruses
- 20. Any Queries
- 21. Thank you
Editor's Notes
- First virus was creeper virus that was detected on ARPANET in 1970s which had ability of self-replication.
- 6000 viruses are created and released every month. The words “love” and “I love you” are most vulnerable words in virus world.
- 70% of virus-writers works under specific contract. Some virus creator might be small children who were just testing their programming skills.
- A virus cannot spread without a human action.
- Similar to virus by design. But can travel without human action.
- May be silly like adding desktop icon continuously. May be vulnerable like deleting the users file or destroying information on the system. Create a backdoor for malicious user leaving them access to everything in your computer. Do not reproduce or self replicate.
- Viruses do not transfer just by opening messages. It spreads after clicking on the link given in the message. 90% messages contain malware.
- Did you know? Virus writing is not considered an illegal act in US.