SYSTEM ANTIVIRUS SOFTWARE ~ ELITCODE

Antivirus software, or anti-virus software(abbreviated to AV software), also known as anti-malware, is a computer program used to prevent, detect, and remove malware.

Antivirus software was originally developed to detect and remove computer viruses, hence the name. However, with the proliferation of other kinds of malware, antivirus software started to provide protection from other computer threats. In particular, modern antivirus software can protect from: malicious browser helper objects (BHOs), browser hijackers, ransomware, keyloggers, backdoors, rootkits, trojan horses, worms, malicious LSPs, dialers, fraudtools, adwareand spyware. Some products also include protection from other computer threats, such as infected and malicious URLs, spam, scam and phishing attacks, online identity (privacy), online banking attacks, social engineering techniques, advanced persistent threat (APT) and botnet DDoS attacks.

Basic Functions of Antivirus Engines

All antivirus engines have three components to function accordingly. It is important to have a look at these functions because it will help us for better manual cleaning of viruses in case we need.

Scanning − When a new virus is detected in the cyberspace, antivirus producers start writing programs (updates) that scans for similar signature strings.
Integrity Checking − This method generally checks for manipulated files in OS from the viruses.
Interception − This method is used basically to detect Trojans and it checks the request made by the operating system for network access.

The following image shows the schema for an antivirus engines functionality.

Online Virus Testing

If the system administrator does not have an antivirus installed or suspects a file that is infected. They would recommend to use the online testing antivirus engine which (according to me) is one of the best – https://virustotal.com/.

Q. Why this option?

Ans. It is a free and independent service. It uses multiple antivirus engines (41 anti-virus engines), so its result will be showing for all the 41 engines. It updates the engines in real-time.

For further clarity, please see the following screenshot, wherein I uploaded a file with virus and the result is 33/41 (Detection Ratio), which means that it has virus and did not pass the class, so it should not be opened.

A good feature of this site is URL checking, before entering to a website you can enter the URL and it checks for you if the site has infection and can harm you.

I did a test with a URL and it came out to be clean and that too 100%, so I can visit it without my computer being infected.

Free Antivirus Software

As this tutorial is hands-on practice, I will show you where to get free antiviruses and where to download in case you don’t have enough budget.

The free versions of anti-viruses have nearly identical malware detection scores to the paid versions produced by the same company, but the commercial antivirus makes a small difference in the performance of security and in our case we are system administrators and we want maximum protection in the work environment.

From the PCMagazine (http://in.pcmag.com/) you can get a review which are the best top rated free antiviruses at the moment. In the following URL you can check by yourself http://www.pcmag.com/article2/0,2817,2388652,00.asp

Let us understand in detail about some of these antivirus software −

Avast Antivirus

This antivirus has good scores in malware blocking and anti-phishing test scans, it can be downloaded from https://www.avast.com/en-eu/index

For server installation you need a commercial version.

AVG Antivirus

It can be downloaded from http://www.avg.com/us-en/free-antivirus-download. For server installation you need to purchase the commercial version.

Panda Antivirus 2016

It can be downloaded from http://www.pandasecurity.com/usa/homeusers/downloads/

It has the following good features −

Rescue Disk
USB protection
Process Monitor

For server installation you will need to purchase the commercial version.

Bitdefender Antivirus

It can be downloaded from http://www.bitdefender.com/solutions/free.htmlA good feature in this antivirus is that it can work entirely in the background. No configuration setting. For server installation you need to buy the commercial version.

Microsoft Security Essentials

Even though it is not among the top-most free antiviruses owing to the Microsoft brand, it is worth a mention that Microsoft itself offers you a free antivirus which is called as Microsoft Security Essentials.

It can be downloaded from http://windows.microsoft.com/en-us/windows/security-essentials-download

Commercial Antivirus

I should mention that all the producers of free antiviruses offers their commercial versions too. Based on PC magazine, the best commercial antiviruses are −