What type of signatures reconize viruses?

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I have read some articles about viruses and when the first viruses came into effect (ELK CLONE) but since then viruses have become more and more advanced and for this reason I would like to know what type of signature a virus scanner uses to find viruses and maybe a real breif explaination of how to start it in VB?

Posted 24-Nov-10 12:37pm

Dale 2012

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Manfred Rudolf Bihy · Accepted Answer · 2010-11-24T13:03:00

What is being called a virus signature is a actually a very complex thing. Checking an unalterable file like an executable, can burn this down to checking an MD5 hash. Other files like word ,excel and other MS Office related files are much harder because the executable macro content has to be checked for common attack.
To condense my answer a bit I'll state this:
- MD5 for content (programs) that do not change
- pattern recognition of viruses in whatever form the may appear
(and this is the really complex and convoluted part
which makers of anti virus software make you pay dearly for :)
)

cheers

Manfred