The full form of VIRUS is Vital Information Resources Under Seize. It is a set of computer programs that disrupts the normal functioning of a computer. It enters a computer without the knowledge of the user.

Types of Virus

There are mainly four types of virus. They are as under.

  1. Boot Sector Virus: It infects the boot sector of a hard drive. It becomes active at the time of booting the machine. Ex: Disk Killer, Stone Virus.
  2. Program File Virus: It infects the executable files with extension like .com, .exe., .sys. It becomes active in the memory by replicating itself and infecting files on disk. Ex: Sunday, Cascade.
  3. Multipartite Virus: It is a hybrid of a boot sector and program file virus. Ex: Invade, Flip, Tequila.
  4. Macro Virus: It infects the  files which are created using such application software that supports Macros such ass word, excel. Ex: Melissa .A, Relax, Bablas.

Some facts about Virus

  • The first PC virus was a boot sector virus named as Brain. It released in 1987 by the Farooq Alvi Brothers in Lahore, Pakistan.
  • The Creeper Virus was first detected on ARPANET in the early 1970’s.
  • MyDoom is considered to be the most expensive virus in the world and in cyber security history, having caused as estimated financial damage of $38.5 billion.

Some of the popular viruses are:

  • Jerusalem or Israeli Virus
  • Brain or Pakistani Virus
  • April First
  • Ping Pong or Bouncing Ball
  • Stoned (Marijuana)
  • Dark Avenger

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