May 23, 2020


Do you know what is meant by virus???

Virus is an abbreviated form of ‘Vital Information Resource Under Seize. Computer virus is a small program that enters into a computer without the knowledge of the user and by replicating itself interferes with the computer.

How does a computer virus find you???

        Sharing music files or photos with other users,

        Visiting an infected web site,

        Opening spam email or an email attachment,

        Downloading free games, media players and other system utilities,

        Installing mainstream software applications without fully reading license agreements etc..

What does a computer virus do???

        Computer viruses are being programmed to harm your

   computer by damaging programs, deleting files or

   reformatting the HDD.

        Others simply replicate themselves or flood a network with traffic, making it impossible to perform any internet activity.

        Even less harmful computer viruses can significantly disturb your systems performance, supping computer memory and causing computer crashes.

What are the symptoms of computer virus???

        Slow computer performance

        Erratic computer behavior

        Unexplained data loss

        Computer restarts on its own

        You see usual error messages

        Strange sounds or music plays from speakers

        The programs disappear from the computer.

Types of computer virus...

  1. Macro Viruses                                          
  2. Memory resident viruses
  3. Overwrite viruses
  4. Direct action viruses
  5. Directory viruses
  6. Multipartite viruses
  7. Fat viruses
  8. Companion viruses
  9. WORMS
  11. Boot infector
  12. Polymorphic viruses


Macro viruses are the viruses infect the files created using some applications or program that contains macros such as .doc .pps .xls and etc... They hide in documents shared through e-mails and other networks. Ex: Relax, bablas, Melisa etc...


They usually fix themselves inside the computer memory. They get activated every time the OS runs and end up infecting other opened files. They hide in RAM (RANDOM ACCESS MEMORY).

 Ex: CMJ, meve, randex etc…


Torjans can illegally trace important login details of users. For example, in E-banking, they may track your ID’s Passwords etc…



These types of viruses delete any information in a file. They infect files leaving them useless.

Ex: Trj.reboot, way  


They encode and encrypt themselves in different way. They use different encryptions and algorithms.


The Boot Sector Virus or Boot Infectors affects the booting process of the computer system. The boot infectors will inversely affect the hard disk of the computer. Many computer viruses and their effect can damage the computer system.

Top 10 most destructive computer viruses:

  1. Melissa
  2. Storm Worm
  3. Red Code
  4. Red Code ll
  5. Nimda
  6. SQL Slammer virus or Sapphire
  7. My Doom
  8. Sasser and Netsky
  9. Leap-A or Oompa-A
  10. The Kelz virus

CREEPER VIRUS Worlds first computer virus...

Creeper was an experimental self-replicating program written by Bob Thomas at BBN Technologies in 1971.Creeper used the ARPANET to infect DEC PDP-10 computers running the TENEX operating system. Creeper gained access via the ARPANET and copied itself to the remote system where the message, "I'm the creeper, catch me if you can!" was displayed


 Antivirus is a software which detects and removes the viruses from the computer system. Antivirus software typically runs as a background process. It scans the computers, servers or mobile devices to detect and restrict the spread of malware. Many antivirus software programs include real-time threat detection and protection to guard against potential vulnerabilities as they happen. They also perform system scans that monitor device and system files looking for possible risks.


 - Chandan M

2nd BCA



Department of Computer Science

Vivekananda college, Puttur D.K

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