Computer Virus

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Brief information about computer viruses.
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Computer Virus

  1. 1. © 2012 Charmaine S. Camilo. All rights reserved.
  2. 2. © 2012 Charmaine S. Camilo. All rights reserved.
  3. 3. © 2012 Charmaine S. Camilo. All rights reserved.
  4. 4. © 2012 Charmaine S. Camilo. All rights reserved.
  5. 5. © 2012 Charmaine S. Camilo. All rights reserved.
  6. 6. A computer virus is a caustic computerprogram that can replicate itself and spread fromone computer to another without the permission ofthe owner. © 2012 Charmaine S. Camilo. All rights reserved.
  7. 7. Viruses Botnet Malware Worms Trojan Horse© 2012 Charmaine S. Camilo. All rights reserved.
  8. 8. • Worms• Boot sector virus• File infection virus• Multipartite virus• Network virus• E-mail virus• Macro virus• Memory resident viruses• Root kit virus• Polymorphic viruses• Logic bombs/Time bombs © 2012 Charmaine S. Camilo. All rights reserved.
  9. 9. The following are some possible indications that a computer has been infected by a virus. These problems can also be caused by non-virus problems, but they are the most reported symptoms of a computer virus infection.• Computer no longer boots up.• Screens sometimes flicker.• Computer runs slower then usual.• PC speaker beeps periodically.• System crashes for no reason.• Files/directories sometimes disappear. © 2012 Charmaine S. Camilo. All rights reserved.
  10. 10. Virus writers have to balance how and when their viruses infect against the possibility of being detected. Therefore, the spread of an infection may not be immediate.Phases of Viruses• Infection phase• Attack phase © 2012 Charmaine S. Camilo. All rights reserved.
  11. 11. • System Sectors/Boot Records• Files• Companion Files• Macros• Disk Clusters• Batch Files• Source Code• Visual Basic Worms © 2012 Charmaine S. Camilo. All rights reserved.
  12. 12. 1. Email attachments.2. Rogue Websites.3. Networks4. Infected Boot Disks5. Phishing Schemes6. Infected Software7. Hackers8. Instant Messaging9. Fake Anti Virus Software10. From Mobile Devices11. Friends and Relatives © 2012 Charmaine S. Camilo. All rights reserved.
  13. 13. • Anti-virus software• Scan your computer on a regular basis• Update your anti-virus software on a regular basis• Back-up• Turn-off E-mail Preview• Scan Removable disk• Scan downloaded files• Scan all e-mail attachments• Beware of e-mail attachments from unknown sources• Be alert! © 2012 Charmaine S. Camilo. All rights reserved.
  14. 14. © 2012 Charmaine S. Camilo. All rights reserved.
  15. 15. © 2012 Charmaine S. Camilo. All rights reserved.

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