Antivirus is a product that has been advertised as a common item similar to a toothbrush, detergent, or car. But, despite being a regular product antiviruses are not free of flaws and issues.
Antivirus programs are unable to keep up with the diversity and quantity of new malwares that are produced every day. It’s an arms race and not every antivirus program available on the market or available online offers a level of security that is close to 100 percent.
Another issue is that viruses and Trojans are able to alter the software on your system, making it so that it is unable to recognize them properly. This may happen because the virus alters the antivirus program’s settings or because it is able to create a false positive by exploiting one of its own functions or features.
There are also many instances where the antivirus software is unable to recognize files, even when they are dangerous. The antivirus software hasn’t yet had a chance to adding the file to its database. In order to do that it must analyse the file and compare its content with known malware-related files in the antivirus’s database. This is a time-consuming and resource-intensive process. And the slower it is, the less accurate is the detection. The antivirus also needs to install interceptors that study system events deep inside the computer’s kernel order to pass the data to its engine.