Monday 18 September 2017

What is Computer Virus? What are various types of viruses?

A computer virus is a malware, when executed replicates by reproducing itself or infecting other computer programs by modifying them. Infecting a computer program include as well, data files or the boot sector of the hard disk when this replication succeeded, the affected areas are then said to be infected.viruses often perform some type of harmful acting o infected host. Such as acquisition of hard disk space or CPU time, accessing private information, corrupting data, displaying numerous messages on the users screen spanning their contents. Here in this tutorial you can learn types of virus and virus prevention techniques.

Various Types of Viruses:

                   The following are six broad categories of virus of all under. Computer viruses are often spread by attachments in e-mail messages or instant messaging messages. That is why it is essential that you never open e-mail attachments unless you know who it's from and you are expecting it.
Boot Sector virus:
                   This virus affects the boot sector of the computer. It resides in the boot sector and is difficult to remove. When the computer is turned on, it copies itself into the memory and infects other files.

File Infection Virus:

                    This virus attaches itself to executable files. When the executable file is activated, the virus also gets activated. Once activated, it infects other files.
Multipartite Virus:
                  This virus affects both boot sector and files and is more dangerous than the other two types. Stealth virus is a type of multipartite virus that is deadly and difficult to locate.

Network Virus:

                 Uniquely created to quickly spread through out the local area network generally across the internet as well typically moves with in shared resources like drivers and folders.

Macro Virus:

        Infects program files that uses macros in the program itself, such as MS Word and MS Excel.

E-Mail Virus:

            Generally this is macro which multiplies by sending itself to other contacts in your address book.

Virus Prevention

                  Today, Many warn viruses travel the internet quickly sicking vulnerable computers this means that your computer can become infected by connecting to the internet although new viruses are being created all the time, there are some steps that you can take to protect your computer.
          Your most important defenses is in starting and regularly updating virus protection software. Although antivirus software is critical, ti is no longer enough to provide maximum protection alone, you should also run Operating system updates regularly.
Other Tips on Virus prevention:-
  1. Avoid opening messages with attachments, even if they are from a friend or known person.
  2. Don't download files from strangers.
  3. Avoid subscribing   



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