A computer virus is a type of malicious software program that can copy itself and spread from one computer to another. Viruses often disguise themselves as legitimate programs or documents to infect users' computers without their knowledge. Once installed, viruses can damage programs, delete files, display unwanted messages, or slow computers by clogging memory. To avoid detection, viruses may kill antivirus tasks before scanning can occur. Antivirus software works by scanning files for known virus signatures and behaviors. It is important to keep antivirus software up to date, avoid opening suspicious email attachments, only download files from trusted sources, and back up files regularly to prevent virus damage.

1. Computer Virus ArnabSingha, VI CSE VipinBorkar, VI CSE 1

3. produced by unknown people and harmful to the computers

4. Some varieties of these software are the

7. Some tend to destroy programs or data

8. Clog computer memory and hence sometimes result in system crashes

9. Format hard disks, Damage programs, Delete files4

11. Presents text, video, or audio messages making the user know their presence

12. Bug-ridden, and these bugs may lead to system crashes and data loss5

14. without permission or knowledge of the user

15. attaches itself to other software programs or data files6

17. over a network such as over the Internet or carrying it on a removable medium - a floppy disk, CD, or USB drive7

19. spread via downloaded software and data files, and email attachments, etc8

21. runs when the user boot the computer from the disk9

23. A virus, in an infected machine, may send a web-address-link as a message to other contacting machines

24. Thinking the link is from a friend (a trusted source), the recipient may sometimes follow the link to the website.10

26. deliberately created by programmers, or by people who use virus creation software11

28. research projects, pranks, vandalism,

29. to attack the products of specific companies,

30. to distribute political messages,

31. and financial gain from identity theft,

32. spyware, and cryptoviral extortion. 12

34. consider their creations to be works of art

35. See virus writing as a creative hobbyReleasing computer viruses is a crime in most jurisdictions 13

37. They do not make themselves to

38. change the date of last modified

39. increase file sizes

40. damage the files14

44. Examin the content heuristics of the computer's memory (its RAM, and boot sectors)17

46. Examine files as they are being opened, downloaded, copied, accessed, and transmitted etc18

48. in order to gain knowledge about the latest threats19

51. Use an OS on a bootable, to start the computer if the installed OS become unusable.21

53. the most important step you can take towards keeping your computer clean of viruses

54. Update your anti-virus software regularly

55. variations of viruses and new ones can be slipped if your software is not current22

57. Configure your anti-virus software to boot automatically on start-up and run at all times23

59. ensure that you examine and scan email and other attachments before they run as they might contain viruses

60. Scan all incoming email attachments

61. Do not open any email attached files if the subject line is questionable, unexpected or the source (address) is unknown, suspicious or untrustworthy 24

63. Do not forward or reply to any of them, they clogs up the network

64. Some viruses can replicate themselves and spread through email as a chain25

66. Ensure that the source is a legitimate and reputable one

67. save all downloads to one folder and test them with your own anti-virus software before use26

72. The more computers flash cards, CDs, zip cards and floppies have been used on, the better the chance of a virus infecting them – clean them before use30

73. Thank You