Is your PC running slower than normal? Polymorphic virus may have attacked it

Polymorphic viruses are those viruses which insert dummy code and use encoding in order to avoid detection. A computer virus happens to be a piece of code which can reproduce itself in a number of ways like attaching itself to files in a system. Apart from reproduction, it can happen in a number of ways, as it has a payload in form of a malicious code. The more the virus can avoid detection, the more successful it is for cyber criminal. Polymorphism is a concealing strategy which cyber criminals apply in order to make detection more difficult.

 Most of the top antivirus softwares available in the market combine heuristics which is behavior based on virus detection and come with signature files which have fingerprints of known viruses. These fingerprints are strings of code feature of a particular virus or virus family. In order to make virus analysis as well as diagnosis more difficult, cyber criminals insert a random code or encode their viruses for concealment. Employing a different encryption scheme or inserting a dummy code for concealment leads to the creation of a different type of virus and fingerprint which is known as polymorphic virus.

        

 Inserting a dummy code in an unencoded virus cannot be concealed and usually it doesn’t take much time for the antivirus software dealer to update his signature database with fingerprint of an encoded virus. Therefore cyber criminals change the virus form by encoding the same virus with different encoding algorithms. These algorithms produce polymorphic viruses. For any virus code there can be a number of polymorphic viruses having the same code but differently encoded executable. So polymorphism makes diagnosis more difficult because of the number of encoding keys used by cyber criminals.

    

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