When your computer gets a virus from an unknown source, you know you are in big trouble.

There are several ways how a computer, an iOS device, and a smartphone can become infected with viruses, malware, and or spyware; the following are the most common:

  • Browsing an unsecured website.
  • Clicking or reading a pop-up message from an unknown source or website.
  • Downloading free software online that might have been infected. Or downloading software coming from an unknownsite or malicious site.
  • Opening email attachments from unknown links.
  • Clicking on malicious online ads (also known as MalAds) that are traceable by online criminals.
  • Through social media.
  • Due to unpatched software.

How will you know that your computer is infected?

  • The system runs slower than usual.
  • You are getting pop-up messages from an unknown site.
  • Programs that unexpectedly run slow or do not open.
  • A browser that does not display.
  • The system is unable to recognize the external drive.
  • Unexpected blue screen of death (a stop error).

Fortunately, there is a lot of security software or antivirus programs that are available in the market today; but how does an antivirus work? If you are curious about the detailed information about antivirus software, this article about how does antivirus work will make you understand.

For now, here are some fast but useful facts about how antivirus works:

#1: Viruses is similar to a PC program

Viruses or malware operate or act similar to the usual PC programs. The difference, however, is the main intention of the program; unlike the usual PC programs, a virus is designed to harm the OS of the computer, harvest or extract essential data that are intended for criminals to use, and destroy the data and even the entire OS of the computer or mobile devices.

#2: Virus contains a signature

Every virus or malware contains a signature – a fingerprint of the virus-containing unique data or code. It is a strain of unique characters or numbers that most antivirus programs are intended to detect. A single strain of virus may contain multiple virus signatures and one huge number of viruses can share a particular signature, which allows the virus-detection program to detect a new strain of the virus.

#3: Antivirus software will do a behavioral detection

Most of the antivirus software is designed to track down, both unknown and known, malware and viruses through a method known as ‘behavioral detection’.  

The virus or malware will try to bypass or shut down the antivirus solutions or will try to make its solution to run every time you start your PC. However, through the behavioral analysis designed in most of the antivirus software, the unusual behavior of the OS if once detected, the system will quarantine the malware and will be deleted.

To ensure that every unusual behavior of the operating system of your computer is detected and every possible virus or malware is quarantine and detected, you should look for the best antivirus program.