How anti-virus and anti-spyware software works?

I'm thinking abuot creating anti-spyware software and interested in information on how to detect mallware.

Please, share your information.

What is the algorith of work of anti-virus and anti-spyware software?

Does they scan each file for suspected text or decompress them on the fly?

Does they looking for dangerous API's?

Or does they just know each mallware in fact, in face?

## Deliverables

1) Complete and fully-functional working program(s) in executable form as well as complete source code of all work done.

2) Deliverables must be in ready-to-run condition, as follows (depending on the nature of the deliverables):

a) For web sites or other server-side deliverables intended to only ever exist in one place in the Buyer's environment--Deliverables must be installed by the Seller in ready-to-run condition in the Buyer's environment.

b) For all others including desktop software or software the buyer intends to distribute: A software installation package that will install the software in ready-to-run condition on the platform(s) specified in this bid request.

3) All deliverables will be considered "work made for hire" under U.S. Copyright law. Buyer will receive exclusive and complete copyrights to all work purchased. (No GPL, GNU, 3rd party components, etc. unless all copyright ramifications are explained AND AGREED TO by the buyer on the site per the coder's Seller Legal Agreement).

## Platform

Windows XP

Compétences : PHP

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