It seems quite simple and easy to say what an Antivirus is. Who has not yet heard about this type of software, its importance, and why it should always be updated, etc., etc.? Here you will find a lot of information related to Antivirus, to help them better understand this type of software and how they work.
Antivirus is a program that helps protect your computer against most viruses, worms, Trojans and other unwanted invaders that can infect your computer
Among the main damages that these programs can cause are loss of microprocessor performance, file deletion, data alteration, confidential information exposed to unauthorized persons, and the uninstallation of the operating system.
Antivirus is one of the basic support points of a personal security system, next to firewalls and spyware detectors. As in the other software categories, it is also possible to find good free and commercial antivirus. Normally, the products monitor virus activities in real-time and make periodic checks, or according to the user’s request.
In addition to having one of those programs, you may want to use an online Antivirus, which does not need to be installed on your computer. It is useful in the case of having already suffered an infection, because some viruses and malicious programs prevent the correct functioning of the antivirus, and continue to act after complete verification of the system.
Virus detection techniques
The Antivirus aims primarily to detect and remove malware from your computer. As the first step is to detect, there are some techniques for that.
Among the detection techniques are:
- Signature Verification
- Heuristic Verification – Behavior Block
Signature verification technique
Signature Verification determines the characteristics that a file takes to be or not considered malware. It is verified features such as file size, the sequence of binary instructions, among others.
When a file is recognized as malware, it receives its own identity, with its respective signature. These signatures are what determine each malware that is part of the antivirus definition list.
Heuristic Verification Technique
Heuristic Verification is the ability of an Antivirus to detect malware, without having a specific vaccine for it; that is, the idea of heuristics is to anticipate the discovery of malware. There is anti-spam software that works with the same philosophy. The big problem with this type of detection method is the possibility of generating a very high number of false positives.
Differences between the best and worst antivirus
- Malware detection time and vaccine distribution
It is important that the Antivirus provider be quick in the detection of new malware and mainly in the distribution of vaccines.
- Frequency of updating the definition list
The definition list should be updated often. Every day many malware arise on the net. If the definition list is not updated often, there is a great chance that we will end up infected.
- Scan time
Scanning time is another important factor. The reading of the files must be quick. A slow scan is always problematic since the machine encounters a process running and absorbing much of its resources.
- Number of identified malware
The best Antivirus is those that manage to detect as many malware as possible. Normally in antivirus tests, this number is the big differential.
- Number of false positives identified
Here, the less, the better.
An Antivirus that detects files without viruses and considers them malware is a big headache. Mainly if you are going to remove a healthy file and make an application or even the operating system stop working.
The price item must be considered. We have nothing against free Antivirus, but if there is a paid version, we agree that this version will be more efficient than the free one. Antivirus prices are so low, it is worth the investment.
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