e-Virus.........

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e-virus(Computer Virus)

• Presented by
• C.Malar Vizhi,
• IV- M.Sc (Software Science),
• Venue Vivekanandha college for women
• Date14/03/2012

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Contents

• What is e-virus?
• Symptoms of computer virus
• Functions of computer virus
• When was computer virus created?
• Ways of virus enter in your computer
• Virus through the Internet
• List of computer virus
• Types of computer virus
• How to protect your computer from virus?
• Virus process
• Conclusion

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What is an e-Virus?

• e-Virus is An Electronic Virus
• A virus is an infectious program which affects
  computer systems and data. Viruses are spread
  from one computer to another computer without
  permission or knowledge of the user.
• Computer viruses do not come into
  existence spontaneously. They are deliberately
  created by programmers.

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Symptoms of Virus Attack

• Computer no longer boots up.
• Screen sometimes flicker.
• Computer runs slower than usual.
• PC speaker beeps periodically.
• System crashes for no reason.
• Files/directories sometimes disappear. Many
  More.

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Functions of computer viruses

• Data Theft
• Corrupt The OS Operating System
• Corrupt The Installed Applications and
  files
• Hack the computer,etc.,

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When computer viruses created

• A program called "Elk Cloner" is credited with
  being the first computer virus to appear "in the
  wild" that is, outside the single computer or
  lab where it was created. Written in 1982 by
  Richard Skrenta, it attached itself to the Apple
  DOS 3.3 operating system and spread by floppy
  disk. This virus was originally a joke, created
  by the high school student and put onto a game.
  The disk could only be used 49 times.

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Ways of computer viruses enter your computer

• e-mail messages or instant messaging messages.
• Attachments of funny images, greeting cards, or
  audio and video files.
• Downloads on the Internet.They can be hidden in
  illicit software or other files or programs you
  might download.

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Virus through the Internet

• Today almost 87 of all viruses are spread
  through the internet.
• Transmission time to a new host is relatively
  low, on the order of hours to days Latent virus
  

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List of computer viruses

• Trojan Horse
• Storm 
• MyDoom 
• Nimda
• I LOVE YOU
• Creeper
• Elk Cloner
• The Morris Worm,etc.,

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Types of computer virus

• Bootsector Virus A virus which attaches
  itself to the first part of the hard disk that is
  read by the computer upon boot up. These are
  normally spread by floppy disks. Macro
  Virus Macro viruses are viruses that use
  another application's macro programming language
  to distribute themselves. They infect documents
  such as MS Word or MS Excel and are typically
  spread to other similar documents.Memory
  Resident Viruses Memory Resident Viruses reside
  in a computers volatile memory (RAM). They are
  initiated from a virus which runs on the computer
  and they stay in memory after it's initiating
  program closes.

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Trojan Horse

• A Trojan horse is a program with hidden
  functionality. An example is a program which
  captures passwords secretly.
• Trojan horses may be encrypted or scattered
  throughout a program, making it difficult to
  detect.
• Trojan horses are broken down in classification
  based on how they breach systems and the damage
  they cause. The seven main types of Trojan horses
  are
• Remote Access Trojans
• Data Sending Trojans
• Destructive Trojans
• Proxy Trojans
• FTP Trojans
• Security software disabler Trojans
• Denial-of-service attack (DoS) Trojans

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• Worm
• A worm is similar to a virus by its design, and
  is considered to be a sub-class of a virus. Worms
  spread from computer to computer, but unlike a
  virus, it has the capability to travel without
  any help from a person.
• The biggest danger with a worm is its
  capability to replicate itself on your system.

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How to protect your computer from computer viruses

• Only open e-mail attachments received from
  sources you trust and that you are expecting.
• Back up your hard drive files frequently and
  maintain multiple backup sets.
• If you are experience unusually slow performance,
  apparent file loss or damage, or other
  abnormalities, immediately check your hard drives
  for infection.
• Do not forward or reply to any to them. These
  types of email are considered spam, which is
  unsolicited.
• Download software only from sites you are
  familiar with, and immediately check it with your
  anti-virus software.

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Virus Process
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Conclusion

• The amount of damage a virus can do depends on
  how much the creator wants to cause. An easy way
  to stop most viruses is to get an anti virus
  program.
• Technology has gone a long way and made it
  easier for these viruses to spread.
• In the beginning most viruses did not do that
  much damage and were made out to be pranks and
  now they have turned into a criminal act. So
  Delete chain emails and junk email.

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Any Queries ??
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Reference

• http//www.microsoft.com/protect/computer/basics/v
  irus.mspx - What is Computer Viruses
• http//www.soe.umich.edu/computingnetwork/howto/av
  oidviruses - How To Avoid Computer Viruses

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