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Monday, March 7, 2011

How does antivirus Software works?



The Antivirus is a Software that detect harmful Softwares like Computer Virus, Computer Worms, Trojan Horses, Spyware, Ad-ware. The are one of the most important part of a computer and save us from many dangers every day. But the Question arises that how do the work?

The Antivirus Work in three main Ways:

  • Signature based detection
  • Checking for Suspicious Behavior
The Main way of detecting is Signature Based Detection.

The Signature Based Detection is the way in which the antivirus compare the content of the file to the dictionary of the viruses. This is a very effective way because it is able to identify all the viruses that are publicly known. The Example of it is like this: If the file is like this 10101010 then the antivirus will compare it with dictionary, if it match's the 10101010 in dictionary than it will be considered as virus. The effectiveness of this method depends on that the virus or Trojan is public if it is not that it may not be able to detect it. Here some Hackers use Crypter software to hide the content of the file e.g 10101010 would become 12121212 now antivirus would not find it in Dictionary because it seems another file to dictionary but in reality the file would still be virus. To coup with this problem Antivirus Dictionaries also include the entries to identify the Crypted Virus. For Example they would also keep 12121212 in Virus Signature and identify that as virus also.

Checking for Suspicious Behavior.

This type include the antivirus running in the real time and observing the behavior of the the files runing. It sees that if the files are overwriting the data without users permission or notification. If this kind of behavior is observed by the antivirus it will suddenly stop the program and ask the user about the reliability of the file. So User can choose the is it All right to let the program work or if it is a virus s(he) can stop it.

So these are two main ways employed by the antivirus to detect the unwanted files. So now always when you run a scan you would know what is happening.

This Article was written by Muhammad Haseeb Javed. He Blogs at http://hackthepc.blogspot.com/.

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