Everything You Need To Know About Anti-Virus? Is It Really Works?
A computer virus is a program that is loaded onto your computer without your knowledge and runs itself to harm your computer.A virus can replicate itself and damage your computer. All computer viruses are man-made. A replicative virus can replicate itself many times to use all available memory of your computer to halt it.Some dangerous viruses are capable of transmitting itself across networks and bypass security systems.Another type of virus is a worm which replicates itself to use available memory but can't attach to other programs.
When a computer virus infects a computer it must change to file on your computer critical areas like Registry or physical memory etc.
How Antivirus Detects Virus?
Anti-Virus detection is based on "Heuristic Based Detection" that uses an algorithm to compare the signature of the known virus against a potential threat. Heuristic-Based Detection allows an antivirus to detect viruses which are modifiedor a newly released virus. But in this method sometimes an antivirus generates a false positive match, Which means this will report an infected file which is not infected.
Signature-Based Detection.
An antivirus detects virus from its signature.Every antivirus has a virus definition file, Database or dictionary that contains thousands of known virus signatures.These signatures allow an antivirus to identify previously known viruses which are analyzed by security professionals. There are over 100.000 different known virus signatures.
Signature-based detection is an excellent way to prevent past known viruses without creating a false warning or detection.Limitation of signature-based detection is that "it can only detect the previously known virus. It can't detect new virus until the definition file is updated with new virus information.
Behaviour Based Detection.
The third method of virus detection is behaviour based.In this method, antivirus detects a program's behaviour running on the computer.If a program begins to perform strange actions, antivirus triggers a warning. Most common behaviours, Antivirus detects, are listed below.
- Monitoring Keystrokes
- Modifying or deleting multiple files at same time.
- Remotely connecting to computers.
- Changing settings of programs.
An antivirus is helpful against viruses if they are monitoring your keystrokes and stealing logs. Antivirus automatically detect such a behaviour of any program and tends it to stop.
If a program is modifying or deleting multiple files at the same time then antivirus automatically detect this suspicious behaviour of the program and stop them immediately.
Antivirus software has the capability to detect a program that is it connecting your computer to other remotely?Antivirus stops this kind of function and makes you more secure.
If an antivirus detects that some program is changing settings of other programs suspiciously it would alarm you and stops making this to changing in settings of other programs.
So these are some good features of antivirus software and now we are discussing some disadvantages and limitations of antivirus.
Disadvantages Of Antivirus.
Slow Down Pc Or Network.
Installing and running an antivirus software can use a lot of computer memory and hard disk space, Which slows down your pc.
Doesn't Fully Protects.
It is not enough, Having an antivirus program with multi-detection methods.Microsoft Security recommends Internet firewall to block viruses and hackers from getting into your computer and stealing data.
False Positive Detection.
Sometimes antivirus detects a file as a virus which is not actually a virus. This detection is known as false positive detection. In this case, you need to turn off your antivirus to install this file. Secondly, whem you want to crack or patch some file your antivirus detects that as a virus so you need to turn off your antivirus.
Conclusion.!
At the end, I recommend if you are bothered about your important data from stealing or being corrupted you need an antivirus software but a paid and genuine I repeat "Paid and Genuine" antivirus software.If you think you can not need such a security so you can ignore antivirus software.
You can easily rely on Windows built-in Firewall and other security options.
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