How does virus spread and how virus is activation?



1.EMAIL

The viruses are most commonly spread through emails.  An email may contain an infected file attachment. Virus can spread if the user opens and downloads an email with infected file.

2.networks

Virus can spread if the user connects with a computer network that contains virus. Internet is an example of such network. When a user downloads a file infected with virus from internet, the virus is copied to computer. It way infects the files stored on the computer.

3.Removable Storage Media

Flash drives and CDs are important means of exchanging data. A virus can also be copied from one computer to other when the user copies infected files using these devices.

4.Pireted Software

     The illegal copy of software is called pirated software. Virus can spread if the user installs pirated software that contain virus. a variety of pirated software is available in CDs and from internet. Some companies internationally add virus in the software. The virus is automatically activated if the user uses the software without purchasing license.

Activation of Virus

When the computer virus starts working, it is called the activation of virus. A virus normally runs all the time in the computer. Different viruses are activation in different ways. Many viruses are activation on a certain date. For example, a popular virus Friday the 13th virus is activated only if the date is 13 and day is Friday.