He is the guardian angel of the computer: he takes care of his health, protects against viruses, and repairs the damage caused by infection. We cannot be without her nowadays. How do you actually detect and eliminate viruses? Why do I need to upgrade? Can you recover all damaged files? In the following, we will take a closer look at this critical tool.
Some Protection Tools
An antivirus program protects us in a number of ways, both occasionally and discreetly. One of the most well-known procedures is a complete scan of your computer. Whether at the user’s initiative or through a routine procedure, scanning allows you to analyze the files one by one and check for viruses. It is much more effective when we suspect an infection. You can choose to analyze all or part of the files or only deal with files on a floppy disk. During the scan, the signature looks for traces of antivirus viruses using its database. Like other executables, viruses are built from code. Whenever a virus is discovered, the authors of the antivirus software record their code called “signature” and merge it into their software database. A signature is a series of characters that the user cannot understand, only the computer can read.
A scan allows us to have a status description of our system at a given moment. To provide real-time and constant protection, virus protection also uses another method: background monitoring . As “ watching”Also known as a virus protection feature – without knowing it – is constantly active. It monitors your computer’s inbound and outbound files, analyzes any new documents stored on disk, downloaded, or e-mailed. With this constant monitoring, the antivirus can keep all suspicious files at bay. Like a scan, monitoring uses the signature database. The antivirus will not be able to detect the latest threats if it is not updated. However, many users are unable to perform the update or do not perform it as often as they should. A late update could prove fatal: three levels of Level 3 and Level 4 viruses emerged within a week at the end of August. Here’s another reason for concern: the rapid emergence of polymorphic viruses, whose signatures change with each infection.
To solve these problems, manufacturers have developed a so-called heuristic research system . This system isolates itself from signatures and employs artificial intelligence tools to detect viruses. It recognizes patterns that may not be appropriate for a healthy application. Example: when you start a program, it first looks for options on the command line. However, viruses behave differently: they look for reproducible files, try to write directly to disk, try to decrypt their originally encrypted code (for polymorphic viruses) and so on. If the antivirus detects an application that contains more abnormal phenomena (such as those containing a hard disk formatting code), it will issue a virus alert. An antivirus can then block unknown viruses and those that are not yet in the signature database. The risk of false alarms (for example, antivirus mistakenly attributes a formatting device to a virus), which is a feature of this method, is minimized due to simultaneous collaboration with devices such asintegrity controller . This tool periodically checks certain software permanent data (such as size, creation date, etc.). Changes in these data confirm the presence of a virus.
As soon as the antivirus detects an infectious virus, it first isolates it to prevent it from multiplying. It then tries to remove the virus by deleting the virus code and restoring the damaged parts of the file. This procedure is possible if the virus spreads by adding its code to the application code. However, some viruses infect entire files, so they cannot be recovered. The antivirus will isolate these files and suggest that the user delete them.