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Technical Tidbits

February 2004

www.CompDevSys.com

Approx. Read Time: 15min   

 

Antivirus - Am I REALLY Safe??


Problem:

  • I have antivirus software installed on my machine, and I still got a virus!
  • My machine runs exceptionally slow after I installed antivirus software.
  • I can't open files that other people email to me.
  • Why do I have to pay an annual subscription, when I already paid for the software?

Description:

There are many myths when it comes to using antivirus software.  The first myth that users need to get past is that just because you have antivirus software, that doesn't mean you aren't at risk to getting a virus.  Antivirus software is only as good as the company developing the software, AND the user using the software (you).

New viruses are released into the wild daily.  And before the antivirus companies can develop protection for each of those new viruses, someone has to get the virus first and then report it.  When you come to think of it, it is amazing that these antivirus software companies can release fixes for new viruses within such a short time-frame.  From the minute a new virus is found, most of these organizations have new updates available within 24-48 hours. Amazing!

Ok, so you purchased the software, installed it, and now you think you are safe.  Nope, you aren't.  You have to keep up with the antivirus updates, or your computer will remain to be susceptible to new viruses.  Sure, it will protect you from all the viruses that they knew of when they packaged the software originally, but normally when you get that software home and install it, it will be overdue for an update.  Most antivirus software provides a very upfront and center approach to updating the antivirus definitions, so it shouldn't be too difficult to find.  All of them also provide an automatic update method that allows the software to update automatically at specified intervals without your intervention.  This is a very nice feature.  Keep in mind, the longer you wait to update your antivirus, the longer it will take to download the updates.  If you update your software at least once a week, then it shouldn't become too burdensome to download.

It is true that some antivirus software may overstep its bounds.  Although they are looking to provide the absolute best protection possible, you may start to see limitations in what you do on your computer.  One of these 'limitations' is in your email attachments.  They may become hidden, so you can't get to them.  This protection feature also comes with the out-of-the-box Microsoft Outlook settings, so make sure you know what is limiting you before you try to resolve the issue.  The following link is for Microsoft's support area on their website, explaining the details of what is blocked, and why.  Take a look at all the "Unsafe" program extensions at the bottom of the page.  Ouch...

http://support.microsoft.com/default.aspx?scid=kb;en-us;290497 (opens in new window)

You may notice that your computer runs slower after installing antivirus software.  This is because the software is setup to scan ALL file activity by default.  This means that if you open a file, save a file, or even copy/paste a file from one location to another, the antivirus checks the file again, and again, and again.  Normally you don't need this level of protection.  Once the file is checked, it should be safe for a while.  You should do a full scan of all files on your computer with the latest antivirus updates.  Most antivirus products allow you to setup to only check the files when opened, and to not check them when accessed.  This gives you sufficient protection.

Now, how much are you willing to pay for the protection of your computer?  Some people say that the annual subscriptions you have to pay for to get the updates are too much.  Antivirus software companies work hard to provide regular updates to their products, because their reputation for protection relies on their product providing as much protection as possible.  Somebody has to pay the employees to develop the updates, test them, make them available, and support them.  Thinking back to the previous statements made about how quickly they provide fixes, and how easy it is for the software to update automatically, an annual fee of about $30 or so sounds pretty reasonable.  Let's look at it this way, if you did get a virus and it took you a few hours to fix it, or you had to pay an administrator to fix your issue, how much would that cost in time and labor?

Summary:

Simply put; everyone needs antivirus software.  Even if you are just a casual user, if you don't have software to protect your system, and if you don't regularly update your software, you are at risk.  And because you are at risk, you also risk infecting all of your friends, family, and co-workers with viruses.  My recommendation is to think of antivirus software as a necessary evil.  It's not so bad when you get used to it!

WARNING:  Beware of Tricks of the Trade. 

Tricks are used to lure users to open file attachments!  For instance, you get an email with a file attachment from a friend.  The name of the attachment is "MyFavoritePicture.gif.exe"  This is just one of many virus aliases out there.  A listing of current viruses can be found at:

http://securityresponse.symantec.com/avcenter/vinfodb.html

Ok, it looks safe because it has the .gif in there telling me it is a valid image file, but in reality, the .gif doesn't mean a thing.  The actual file extension is .exe, regardless of what precedes it.  And if you don't know already, .exe files should never be opened as attachments from within email, unless an administrator is assisting you!

Tricks are also used to deceive users into removing important files from their computer.  If you receive instructions in an email that requests that you remove anything from your computer, contact a network administrator to make sure it is safe.  There are many email hoaxes out there that have you remove a valid Microsoft Windows program from your computer with a teddy bear icon.  Needless to say, the email is a hoax, and fools even some administrators.


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© 1997, Computer Development Systems, LLC ®