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virus

  1. 1. Computer Virus<br />ArnabSingha, VI CSE<br />VipinBorkar, VI CSE<br />1<br />
  2. 2. What is a Computer Virus<br /><ul><li>A kind of software programs
  3. 3. produced by unknown people and harmful to the computers
  4. 4. Some varieties of these software are the
  5. 5. Viruses, WormsandTrojan horses</li></li></ul><li>Title<br />What is a Computer Virus<br />The term “Virus" is often commonly used<br />to describe all kinds of malware (malicious software)<br />3<br />
  6. 6. Title<br />Damages done by Viruses<br />Viruses<br /><ul><li>Sometimes display unwanted messages
  7. 7. Some tend to destroy programs or data
  8. 8. Clog computer memory and hence sometimes result in system crashes
  9. 9. Format hard disks, Damage programs, Delete files</li></ul>4<br />
  10. 10. Damages done by Viruses<br /><ul><li>Simply replicate themselves
  11. 11. Presents text, video, or audio messages making the user know their presence
  12. 12. Bug-ridden, and these bugs may lead to system crashes and data loss</li></ul>5<br />
  13. 13. Virus spreading methods<br /><ul><li>A viruses can copy itself and infect a computer
  14. 14. without permission or knowledge of the user
  15. 15. attaches itself to other software programs or data files</li></ul>6<br />
  16. 16. Virus spreading methods<br /><ul><li>Spreads from computer to computer when the host is taken to the uninfected computer
  17. 17. over a network such as over the Internet or carrying it on a removable medium - a floppy disk, CD, or USB drive</li></ul>7<br />
  18. 18. Virus spreading methods<br /><ul><li>Many viruses are existed in the Internet today and new ones are discovered every day.
  19. 19. spread via downloaded software and data files, and email attachments, etc</li></ul>8<br />
  20. 20. Virus spreading methods<br /><ul><li>Some old viruses are installed themselves into the disk boot sector
  21. 21. runs when the user boot the computer from the disk</li></ul>9<br />
  22. 22. Virus spreading methods<br /><ul><li>Some viruses spread through instant messaging
  23. 23. A virus, in an infected machine, may send a web-address-link as a message to other contacting machines
  24. 24. Thinking the link is from a friend (a trusted source), the recipient may sometimes follow the link to the website.</li></ul>10<br />
  25. 25. How Viruses are born?<br /><ul><li>Unlike biological viruses, computer viruses do not simply evolve by themselves…
  26. 26. deliberately created by programmers, or by people who use virus creation software</li></ul>11<br />
  27. 27. How Viruses are born?<br /><ul><li>Viruses are written as
  28. 28. research projects, pranks, vandalism,
  29. 29. to attack the products of specific companies,
  30. 30. to distribute political messages,
  31. 31. and financial gain from identity theft,
  32. 32. spyware, and cryptoviral extortion. </li></ul>12<br />
  33. 33. How Viruses are born?<br /><ul><li>Some virus writers
  34. 34. consider their creations to be works of art
  35. 35. See virus writing as a creative hobby</li></ul>Releasing computer viruses is a crime in most jurisdictions<br />13<br />
  36. 36. Viruses can avoid detection<br /><ul><li>To avoid detection by users, viruses employ different deception methods
  37. 37. They do not make themselves to
  38. 38. change the date of last modified
  39. 39. increase file sizes
  40. 40. damage the files</li></ul>14<br />
  41. 41. Viruses can avoid detection<br /><ul><li>They kill the tasks associated with antivirus software before it can detect them!!</li></ul>15<br />
  42. 42. Viruses can avoid detection<br /><ul><li>They kill the tasks associated with antivirus software before it can detect them</li></ul>16<br />
  43. 43. How Antivirus software works?<br /><ul><li>Use a heuristic algorithm to find viruses based on common behaviors
  44. 44. Examin the content heuristics of the computer's memory (its RAM, and boot sectors)</li></ul>17<br />
  45. 45. How Antivirus software works?<br /><ul><li>Some anti-virus programs gives you a real time protection
  46. 46. Examine files as they are being opened, downloaded, copied, accessed, and transmitted etc</li></ul>18<br />
  47. 47. How Antivirus software works?<br /><ul><li>They need regular updates
  48. 48. in order to gain knowledge about the latest threats</li></ul>19<br />
  49. 49. Damage prevention & data recovering<br />How to prevent damages caused by viruses?<br /><ul><li>Take regular backups (including OS) on different media, unconnected to the system (most of the time)</li></ul>20<br />
  50. 50. Damage prevention & data recovering<br />How to prevent damages caused by viruses?<br /><ul><li>Use backups on optical media like CD and DVD (read-only), as they can no longer be affected by viruses.
  51. 51. Use an OS on a bootable, to start the computer if the installed OS become unusable.</li></ul>21<br />
  52. 52. Keep your computer Virus free<br /><ul><li>Install reliable anti-virus software
  53. 53. the most important step you can take towards keeping your computer clean of viruses
  54. 54. Update your anti-virus software regularly
  55. 55. variations of viruses and new ones can be slipped if your software is not current</li></ul>22<br />
  56. 56. Keep your computer Virus free<br /><ul><li>Get immediate protection
  57. 57. Configure your anti-virus software to boot automatically on start-up and run at all times</li></ul>23<br />
  58. 58. Keep your computer Virus free<br /><ul><li>Don't automatically open attachments
  59. 59. ensure that you examine and scan email and other attachments before they run as they might contain viruses
  60. 60. Scan all incoming email attachments
  61. 61. Do not open any email attached files if the subject line is questionable, unexpected or the source (address) is unknown, suspicious or untrustworthy </li></ul>24<br />
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  69. 69. Title<br />Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Vivamus et magna. Fusce sed sem sed magna suscipit egestas. <br />Lorem ipsum dolor sit amet, consectetuer adipiscing elit. Vivamus et magna. Fusce sed sem sed magna suscipit egestas. <br />

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