Why do I need an antivirus?

07.03.2017

So, why do you need a constantly running antivirus that scans all the activity of your computer if the computer starts to work much more slowly from this?

After all, you can determine the infection by symptoms - for example, when everything begins to brake or fly out. And run the scan and treatment with antivirus after infection. I picked up the viruses, after a week or two I was cured and happy.
With a working antivirus (real time scanning), the computer will run slower - unfortunately this is a fact. At the same time, this gives a 99% guarantee against infection with viruses. 100% guarantee can not give anyone.

What's wrong, if suddenly you have a virus on your computer?

In principle, maybe nothing bad is specific to you. It all depends on why you use the computer. If you have unlimited Internet and the computer is used only for games, then no viruses are dangerous for you - even if the virus sends hundreds of messages or viruses from your computer via the Internet - you may not notice it. A few gigabytes of additional traffic per month now few people are afraid, if the Internet is unlimited. Well, if not unlimited, then at the end of the month you will learn about the virus from the account for the Internet.

And imagine that you have stored on your computer your favorite photos and you go from it to your favorite vkontakte or odnoklassniki, or ICQ. In this case, the virus can find out your passwords and automatically change them on these sites. And then ask you for money to return the password. Or with photos - the virus encrypts them with a clever algorithm, and you are sent a message that you have to pay to decrypt it. Only 10 dollars. I do not invent - this is an example of a real virus. Now this virus is a whole epidemic and most in such cases pays.


Let's consider an even more sad case. Now many people use online transactions with a bank account.
Do everyone know that recently there have appeared many banking trojans?

This is a special kind of Trojan virus that sits on your computer and does not manifest itself until you go to one of the online banking sites. And it is at this moment that the Trojan is activated and where does your money go? Last year, F-Secure helped catch the author of one of these Trojans - it was a man from Iraq. Usually, money goes to countries where it is almost impossible to catch a thief. Therefore, in addition to the antivirus, it is not unreasonable to have limits on one-off transfers from a bank account - remember that 100% guarantee is not given by anyone, and the lost money is rarely returned, so it is better to have several protection lines.

But this is not the most unpleasant incident.

Suppose that a large software company has a server that builds builds. And this server does not have antivirus and it got infected. As a result, the next version of the product will be collected, which will also be infected with this virus. Further we will imagine that testers also do not have antivirus software. They tested the product, signed it and it was unreleased. And got on sale. With the virus inside. What will it cost for the company? If the company is small, then this may be the end. At least the end of the reputation.

Is it easy to get infected with a virus?

If you have Windows, then the answer is yes. For example, I know several sites that are easy to access and already infected. To get to these sites can be completely random, trying to find something on the Internet for free or "with a strawberry." I signed today a paper on the non-distribution of malware, so I will not give you links

Or a newly discovered vulnerability in the RPC Windows subsystem. It allows you to infect you through the Internet with a virus even without your participation, if you have Server Service enabled.

Is it easy to cure a computer that is already infected with a virus?

The answer depends on which virus the computer is infected with. Some viruses are deleted at a time, and some are removed even by not all antiviruses. Moreover, there are viruses that no antivirus can remove if the virus has already been activated. From such viruses only permanent protection helps, which will not allow it to start.
So approach at first I will be infected, and then I will be cured - it is unviable.

How can you protect yourself from viruses?

Here are a few lines of defense. None provides 100% guarantee, but the more borders, the less likely the infection.

1. Install an antivirus that will work in real time. A better package of programs, where there will be both an antivirus and a firewall. And the anti-virus database must be updated every day, otherwise you are vulnerable to new viruses.

2. Use the user account. Do not use admin rights.

3. Scan all the disks periodically with antivirus. This is necessary, because The anti-virus database is updated and it can detect new viruses on your disk that were not in the previous databases and which it missed at real time scanning.

4. Always trust the antivirus if it says there is a virus in the file. Even if your friend sent it to you and is afraid that everything is clean. False positives happen, but not often.

5. Have a thoughtful scenario of actions in case of infection. How to save or restore data (backup), how not to infect others, etc.

6. Do not use Internet Explorer to access the Internet. Plus, you can prevent ActiveX from running in the browser that you are using.

7. Prevent autorun from flash media. Now there are a lot of viruses that infect flash media and if you have autostart for flash, then you will automatically be infected when you connect the flash drive. For example, you can carry print photos on a flash drive, and give it to you already with viruses, and you connect it to yourself and voila - the virus already has you.

255. For special connoisseurs: install MacOS. And start Windows in VMWare. Then you can remove the remaining defensive lines


You can always contact our company for advice and purchase of antivirus software. We will also help you develop a security strategy for your company.

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