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I’m quite sure that you’re all using AntiVirus softwares. You might have been using the commercial antivirus softwares or even the open source ones. This article is not going to tell any best antivirus softwares , but it’s more into basic AntiVirus knowledges. It’s all about things that Security Professionals should know and understand. Here they are :

1. Virus signature / database/data mask/ is an algorithm or a set of algorithms which calculate a hash to distinctively identify the strains of a virus.

2. A generic anti-virus checks the database or virus signature and a heuristic anti-virus uses heuristic algorithm and checks malicious character in virus behaviour by different statistical and other advanced means.

3. Common place where a virus may reside are

RAM
Boot Records
Master Boot records
Different type of files

4. A good anti-virus should have the following capabilities:

Script checking
Compressed Files/folder checking
Quarantine capability
Email and web mail checking
P2P/File Sharing Protection
Registry checking
Macro protection

5. Inoculators calculate snapshot of a fresh program and checks any change thereafter. This is one of the best ways to counter virus but think what will happen if snapshot is calculated on infected file/program. ?

6. Integrity checker anti-virus calculates Calculates Cyclic Redundancy Checks (CRC).

7. Immunizer inserts a small piece of malicious code to provide protection against that malicious agent.

8. How Behaviour blocker anti-viruses work?. I leave this point for my readers to answer.

9. False positive condition means anti-virus reports a virus when actually no virus is there.

10. False negative is actually reverse of the false positive. In false negative is a situation where anti-virus fails to find a virus when virus actually exists in the system.

source : http://passcisa.blogspot.com/2008/08/application-softwarehardware-which.html

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10 Important Things about AntiVirus is posted on October 22nd, 2008 by admin. This post is filed under: News, Security, secInfo .