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How does antivirus work?

BingMag.com <b>How</b> <b>does</b> <b>antivirus</b> work?

antivirus is a powerful and essential program for Windows computers. If you've ever wondered How antivirus programs detect viruses and whether regular scans are necessary to find viruses, read on.

Moment Scan

An antivirus runs in the background of the system and scans every file you open. When you double-click an EXE file, it may appear that the file is running instantly. But in fact, the antivirus first compares the program with a bank of viruses and malware. In addition to comparing known viruses, antiviruses also monitor the behavior of programs to further investigate if they are behaving suspiciously. Of course, some viruses are not known at first, but by examining the behavior of programs, they can be largely prevented.

Antiviruses also check the types of files to find viruses. For example, a ZIP file or even a Word file may contain a dangerous virus. As these files are scanned by antivirus very quickly before opening. Although you can disable the ability to scan your antivirus instantly, this is usually not recommended. This is because some viruses take advantage of security holes in the operating system, so when activated, the antivirus may not find them.

Full system scan

BingMag.com <b>How</b> <b>does</b> <b>antivirus</b> work?

Due to the ability to scan instantly, a full system scan is usually not necessary. This means that if a virus enters your system in any way, the antivirus will usually be able to detect the presence of the virus at the same time, and you no longer need to manually scan the system.

However, a full system scan for some Conditions can be fruitful. For example, when you have just installed an antivirus, you can make sure that your computer is free of viruses by scanning the entire system. On the other hand, many antiviruses usually scan the entire system at least once a week. This allows the program to detect even inactive viruses in the system.

On the other hand, if you want to connect your system hard drive to another computer, then a full scan of the hard drive is recommended. . However, you do not normally need to do a manual scan because the antivirus scans the entire system regularly in addition to the instantaneous scan.

Virus Database

antivirus on your computer should use a database that contains the specifications of all known viruses to detect viruses. For this reason, antiviruses are usually updated at least once a day. When the antivirus detects that it has a profile file of one of the viruses registered in the database, it quarantines it. Depending on the antivirus settings, the file may be automatically deleted or allowed to be quarantined.

antivirus developers are always looking for different methods. New viruses are detected and a large part of this process is done automatically.

Machine learning

BingMag.com <b>How</b> <b>does</b> <b>antivirus</b> work?

Another interesting feature of antiviruses is the use of machine learning models to detect new viruses. These models have been created using millions of viruses and malware to identify their common features. This is why even if a malware or virus is not in the database, the antivirus can detect many new viruses.

For example, if the antivirus detects that one of the files wants its code In EXE files located in different parts of the system, such a process is detected and the activity of the virus is prevented. Of course, no antivirus is perfect, so such actions may put a lot of pressure on the system, or if the machine learning models are not created properly, some software may be considered a virus without any problems.

False Positive

Due to the sheer volume of viruses, sometimes a completely problem-free file or program is known as a virus. Such a process is called "false positive". Antiviruses sometimes even treat system files that come with the operating system as viruses. Overall, however, this is rarely the case. So when an antivirus detects a file as a virus, in most cases it is best to trust that diagnosis.

If You are also not sure if the file or program you are looking for is viral, you can upload it to the Virustotal site, which is a subset of Google. This site scans the files carefully and then shows what the different antivirus have to say about these files.

In this regard, we should note that Iranian users use an illegal version of many programs. They say that illegal methods should be used to crack them. Although some always recommend that these illegal methods should not be used in any way, due to the high price of these softwares, there is practically no choice but to use this method. Antiviruses usually treat cracked programs as malware. Therefore, if you are unsure of the source where you downloaded the software, it is recommended that you disable the antivirus before installing and cracking the programs. You should also quarantine files that are cracked as viruses.

detection percentage

BingMag.com <b>How</b> <b>does</b> <b>antivirus</b> work?

Different antiviruses have differences in detection rates, which goes back to their machine learning models and databases. In this regard, some organizations and sites regularly compare the detection rate of antivirus. One of these sites is av-comparatives, which regularly performs various tests in this field.

In this field, we see the rise and fall of antivirus in the table related to the detection rate. That's why you can use this site to compare the performance of different antiviruses.

Last word

Overall, antiviruses are very complex programs. While many companies encourage users to buy antivirus software, the fact is that Windows has a great antivirus by default that covers all the needs of regular users. That's why buying an antivirus is only worth it if, for example, you have very sensitive files on your system or you are always at risk for security. But for the general public, the system's default antivirus is sufficient.

  • List of best online and offline antivirus for Windows and Mac

Source: How To Geek

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