Antivirus Software

Antivirus is a type of software used to secure, detect and remove computer viruses from computer systems. Antivirus Virus Protection Software is also called. This application can determine whether a computer system has been infected with a virus or not. Generally, this software runs in the background (background) and do a scan of all files that are accessed (opened, modified, or when saved).

Antivirus - latest antivirus now not only detect the virus. An antivirus program is now also equipped with the ability to detect spyware, rootkits, and malware - other malware. Not only that, the antivirus is now equipped with a firewall to protect your computer from hacker attacks and to prevent the entry of anti-spam junk email and / or viruses into the user's inbox.


How it works

In general, how the virus is:

Detection by using virus signature database (virus signature database): The workings of this antivirus is the approach used by many traditional antivirus, looking for signs of the presence of the virus by using a fraction of the virus code that has been analyzed by antivirus vendors, and has dikatalogisasi according to its type, size, power and destruction of several other categories. This method is particularly fast and reliable way to detect viruses that have been analyzed by antivirus vendors, but can not detect the new virus until the virus signature database newly installed into the system. Virus signature database is available from antivirus vendors and generally can be obtained for free via download or via subscription (subscription), and / or
Detection by looking at how the virus works: How it works like this antivirus is a new approach that was borrowed from the technology applied in the Intrusion Detection System (IDS). This method is often referred to as Behavior-blocking detection. This uses a policy (policies) that should be applied to detect the presence of a virus. If there is a software behavior that is "not reasonable" according to the policy being applied, as well as software that tries to access the address book to send e-mails en masse to an e-mail list within the address book (the method is often used by virus to transmit the virus through e-mail), then the antivirus will stop the process performed by the software. Antivirus also can isolate the code that is suspected as a virus until administrators decide what to do next. The advantage of this method is the antivirus can detect new viruses that have not been recognized by virus signature database. The drawback, obviously because the antivirus software to monitor the workings of the overall (not monitor the file), then the antivirus makes frequent false alarms or "False Alarm" (if the antivirus configuration is too "hard"), or even allow the virus to multiply in the system (if antivirus configuration is too "soft"), false positives occur. Some manufacturers call this technique as a heuristic scanning. Heuristic Scanning technology has progressed so far until now. Some anti-virus check on a file with the usual definition. If the usual escape detection, then the file is run in a virtual environment. All changes made are such as a virus file, then the user will be warned.

source: http://id.wikipedia.org/wiki/Antivirus


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