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COMPUTER VIRUSES
WHAT IS A COMPUTER              VIRUS?A computer virus is a small software program that spreads from one computer toanothe...
WORKING OF COMPUTER        VIRUS     A Computer Virus needs another program in order to be able tobe activated and infect ...
TYPES OF COMPUTER VIRUSES Stealth viruses Use certain techniques to avoid detection. Macro Viruses Infects the macros wi...
TYPES OF COMPUTER VIRUSES Boot viruses Affects boot sector of a floppy or hard disk. Program viruses Infect executable p...
TROJAN HORSECovertLeaks informationUsually does not reproduce
WORMSSpread over network connectionWorms replicateFirst worm released on the Internet was calledMorris worm, it was rel...
WHAT CAN VIRUSES DO? Format hard disk Copy, rename and delete files Modify files dates and extensions Display false me...
SYMPTOMS Computer runs slowly Random restarts Unknown and uninstalled icons on desktop Icons change in appearance Sys...
HOW VIRUS SPREADS? Email  Opening and downloading an email containing virus Networks  Connecting with network that conta...
W H O C R E A T E S V I RU S E S A N D W H Y ?Common people: For fun Release anger Take revenge For fameProfit earners...
HOW TO PROTECT FROM              VIRUS? Latest antivirus should be installed Antivirus software must be upgraded regular...
TOP SEVEN ANTIVIRAL  PROGRAMS     Kaspersky Antivirus      Avira Antivirus     Mcafee Antivirus     Symantec Norton An...
GENERAL SECURITY TIPS      Apply user-level security on file sharing when         needed.      Dont open email attachmen...
1311782 634629102605888750
1311782 634629102605888750
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Transcript of "1311782 634629102605888750"

  1. 1. COMPUTER VIRUSES
  2. 2. WHAT IS A COMPUTER VIRUS?A computer virus is a small software program that spreads from one computer toanother computer and that interferes with computer operation. A computer virusmay corrupt or delete data on a computer, use an e-mail program to spread thevirus to other computers, or even delete everything on the hard disk..CHARACTERISTICS OF A COMPUTER VIRUS: the ability to replicate itself. the ability to attach itself to another computer file.
  3. 3. WORKING OF COMPUTER VIRUS A Computer Virus needs another program in order to be able tobe activated and infect other computers files. For example, a virus might attach itself to a spreadsheetprogram. Each time the program runs, the virus runs too. A file containing virus is called infested file.
  4. 4. TYPES OF COMPUTER VIRUSES Stealth viruses Use certain techniques to avoid detection. Macro Viruses Infects the macros within a document or template. Polymorphic viruses Encrypt its code in different ways Metamorphic viruses Rewrite themselves each time they infect a new file.
  5. 5. TYPES OF COMPUTER VIRUSES Boot viruses Affects boot sector of a floppy or hard disk. Program viruses Infect executable program files. Multipartite viruses A hybrid of Boot and Program viruses. Directory VirusDirectory viruses change the paths that indicate the location of a file
  6. 6. TROJAN HORSECovertLeaks informationUsually does not reproduce
  7. 7. WORMSSpread over network connectionWorms replicateFirst worm released on the Internet was calledMorris worm, it was released on Nov 2, 1988.
  8. 8. WHAT CAN VIRUSES DO? Format hard disk Copy, rename and delete files Modify files dates and extensions Display false message every few times Damage data Damage software
  9. 9. SYMPTOMS Computer runs slowly Random restarts Unknown and uninstalled icons on desktop Icons change in appearance System memory and disk space is reduced New windows open up at an alarming rate Error messages on regular basis Files mysteriously disappear
  10. 10. HOW VIRUS SPREADS? Email Opening and downloading an email containing virus Networks Connecting with network that contains virus Removable Storage Media Floppy discs, CDs and flash devices Pirated Software Installing pirated software that contains virus
  11. 11. W H O C R E A T E S V I RU S E S A N D W H Y ?Common people: For fun Release anger Take revenge For fameProfit earners: Antivirus marketInfo attackers: Disrupt enemy’s information and network
  12. 12. HOW TO PROTECT FROM VIRUS? Latest antivirus should be installed Antivirus software must be upgraded regularly Unknown emails should not be opened Unauthorized software should not be installed Removable storage media should be scanned Freeware and shareware software from internet should be checkedbefore installing
  13. 13. TOP SEVEN ANTIVIRAL PROGRAMS Kaspersky Antivirus  Avira Antivirus Mcafee Antivirus Symantec Norton Antivirus Bit Defender 2010 Quick Heal Antivirus AVG Antivirus
  14. 14. GENERAL SECURITY TIPS  Apply user-level security on file sharing when needed.  Dont open email attachments from unknown senders.  Use Rich Text Format files instead of Word Documents.  Updated anti-virus program  Set the BIOS boot sequence  Write protection
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