3 Top Ways People Get Infected by An Email Virus

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get infected by an email virusViruses are some of the oldest parasites known to humans. They probably evolved while the first cells started to populate the planet. With the invention of computers, witty programmers copied the properties of biological viruses and translated them into tiny computer programs.

The sole purpose of any virus is to replicate and spread itself. Damage to the host system is a potential consequence. The most common way for a virus to enter a computer is via email. So how do people get infected by an email virus?


Shouldn’t everyone know how viruses enter a computer and be prepared? In this article I will explore the top 3 ways people get infected by an email virus and I will point out how you can avoid such a virus infection.

1. A Virus As An Email Hoax

As mentioned in the introduction, viruses typically are programs. But that’s not always the case. Some viruses speculate on nothing but your naivety. Did you ever forward a chain letter, a virus warning, or the email of a desperate parent whose child needed an organ donation? You probably fell for a hoax and helped to spread it.

In this case the virus is the email itself, although it’s not really an infection. The damage, however, is the same as with other viruses: clogging up of inboxes and mailservers. Email viruses generally cause a waste of time, resources, and energy.

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Next time you receive a potential hoax email, don’t forward it unless you’re sure it’s genuine. About.com features Top 10 lists of latest viruses, virus alerts, and virus hoaxes. Hoax-Slayer is a good resource to get informed about email hoaxes and eventually verify the credibility of an email you have received. Or if the email has tried to defraud you or steal your information, report it to the proper authorities.

2. A Virus In An Email Attachment

While forwarding an email doesn’t cause you any major damage, an infection with a “real” computer virus, i.e. a self-replicating program, is a lot more critical. There are “harmless” variants that just forward themselves to your contacts. However, a virus may also be programmed for example, to destroy specific files on your system.

Most viruses are delivered through an email attachment. Attachments that contain viruses are either executable programs (file types: .com, .exe, .vbs, .zip, .scr, .dll, .pif, .js) or macro viruses (file types: .doc, .dot, .xls, .xlt). The safest way to avoid them is to not open email attachments.

Note that you can safely open Word documents in alternative programs that don’t support macros, such as Wordpad or Open Office. Some viruses try to hide their true file extension by adding two of them. That’s what the ILOVEYOU virus did; its name was “LOVE-LETTER-FOR-YOU.TXT.vbs”.

get infected by an email virus

The good news is that downloading and reading the email will not do you any harm. As long as the attachment is not opened, the virus won’t hatch. If you don’t know the sender and if the email text is suspicious, just delete the email along with the attachment.

If one of your contacts, however, was infected by a virus, the fraud is not as easy to spot. Carefully review each email and play it safe. Many web mail services can scan email attachments for viruses. If you use a desktop mail program like Thunderbird or Outlook and don’t have a virus scanner that can scan email attachments, you may save (not open!) the attachment to your hard drive, where it becomes accessible for your virus scanner. Just remember never to open an attachment before it was scanned.

3. A Virus In The Email Body

Last but not least, malicious content can be found in the body of an email. Today, HTML is a common element of emails as it is used to embed pictures and links. However, HTML can also be used to embed scripts that execute automatically and subsequently infect your computer with a virus. That’s why many mail programs, by default, block HTML and make you click a button to display content of trustworthy sources. It’s a precaution you should not turn off.

Also, URLs can be a virus in disguise. You may see a harmless link that either leads you to a website that executes a malicious script or links to a completely different URL where you automatically download a self-executing virus.

get infected by an email virus

Taken together, the same rule as for attachments applies: never view or access links from suspicious sources.

Summary

The reason why all these strategies work is because the respective email is cleverly designed to foul its recipients. It may be a harmless call for sympathy or a threat that calls for instant action. Most people will readily click any link that is presented to them in order to solve a problem or access further information.

What you can do is the following:

  • Act smart, not fast.
  • Verify the source of any suspicious email before you act.
  • Generally, do not blindly forward emails, open attachments and links, or view HTML content.
  • Get an antivirus program and regularly update its virus definitions.
  • Make sure your mail program is set to not automatically download and open attachments or display HTML content.

For more background information on viruses and malware, check out the following articles:

Did you ever get fouled by an email and ended up geting infected by an email virus? What got you?

Image Credits: Don Hankins, kveselyte, doctor-a, OmirOnia

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20 Comments - Write a Comment

Reply

Elisabeth Podair

I sent this to my mom…the only person I could think of that still wouldn’t know these tips and actually infects my parent’s computer on a frequent basis.

Tina

Belief me, your mom is not the only one. There are plenty people out there who don’t ‘get’ it, yet. Unfortunately, few of them read MakeUseOf. Thank you for forwarding the article! :)

Reply

Elvin

Instead of teaching useless stuff in schools they better teach people how to use computers/internet safer. oh wait… they still blame the antivirus.

Tina

Very good point Elvin. Schools aren’t adapting quick enough to electronic age. Instead of teaching kids facts, they should focus on teaching them tools and concepts.
One of the most important tools today is without doubt the computer and everything associated with it, i.e. internet, social media etc.

WendyElf

At my school we teach our 11 year olds as much as we can re. internet safety (especially regarding social media sites – we have just discovered that many of our 9/10/11 yr old pupils have facebook accounts). I feel it is VERY important they are taught internet awareness – and yes, I agree some schools aren’t adapting quickly enough to the electronic age. In my school, I am the only one passionate about ICT – and I have found it is not just my task to teach the children these things, but the teachers too. Most are not computer savvy, and have not had the time, training, interest or understanding to keep abreast of what is going on – they are already so overworked and drowning in often senseless paperwork I am surprised many of them have not imploded….
Personally too, I really do believe that kids brought up now in this digital age are working their brains in far different ways than my generation experienced – the full effects of which we will not see until they are adults.
Elvin – our primary school teaches more than ‘useless stuff’…. trust me…. :). Teaching them tools and concepts yes, but also, how to achieve their full potential as alive, aware, responsible human beings, and how to live on this planet and treat it, and each other, with respect and humanity. (Then hopefully how to set up a blog and write about their experiences!!! Hahahaha)

Reply

JK III

Common sense is the most important factor. People ignore the warning and proceed to open “new folder.exe” and then blame it on the anti virus. That’s why I recommend avast in favour of AVG; it gives you only 3 options when a malware is found: delete, move to chest, block. (I am talking about real-time shield only.) There is no way you can open a malware unless you open the main program window and add it to exceptions. To be honest, recently a virus sneaked through network and infected my computer. But it was my fault that I did not have a firewall; avast free does not have a full fledged firewall.

Now my main question: Will a firewall or anti virus protect me from automatically running, malware infested code (as mentioned in no. 3) or do I have to be extra careful?

Tina

JK,thanks for the input! Regarding your question…A firewall should prevent access to your computer from outside sources. Hence, it should block everything that is sent through a URL you’re visiting. If the script / virus attempts to connect to your computer, the firewall will ask you whether you wish to grant this access. If you confirm, the virus is in.Anything that is already on your computer should be caught by your antivirus program. However, if you execute a script that is embedded in an eMail, your antivirus program may not catch it, either because it doesn’t scan your mail program or because it lacks the necessary virus definitions and doesn’t know this virus, yet.A firewall with strict settings provides an extra safety layer that may be 99% efficient, but it’s also quite annoying. It’s easier and just as efficient to generally disable HTML / image display in eMails. Then only enable it for trusted sources.Hope this answers your question. :)

JK III

Thanks.

Reply

JK III

Common sense is the most important factor. People ignore the warning and proceed to open “new folder.exe” and then blame it on the anti virus. That’s why I recommend avast in favour of AVG; it gives you only 3 options when a malware is found: delete, move to chest, block. (I am talking about real-time shield only.) There is no way you can open a malware unless you open the main program window and add it to exceptions. To be honest, recently a virus sneaked through network and infected my computer. But it was my fault that I did not have a firewall; avast free does not have a full fledged firewall.

Now my main question: Will a firewall or anti virus protect me from automatically running, malware infested code (as mentioned in no. 3) or do I have to be extra careful?

Reply

Tina

Very good point Elvin. Schools aren’t adapting quick enough to electronic age. Instead of teaching kids facts, they should focus on teaching them tools and concepts.
One of the most important tools today is without doubt the computer and everything associated with it, i.e. internet, social media etc.

Reply

Tina

JK,

thanks for the input! Regarding your question…

A firewall should prevent access to your computer from outside sources. Hence, it should block everything that is sent through a URL you’re visiting. If the script / virus attempts to connect to your computer, the firewall will ask you whether you wish to grant this access. If you confirm, the virus is in.

Anything that is already on your computer should be caught by your antivirus program. However, if you execute a script that is embedded in an eMail, your antivirus program may not catch it, either because it doesn’t scan your mail program or because it lacks the necessary virus definitions and doesn’t know this virus, yet.

A firewall with strict settings provides an extra safety layer that may be 99% efficient, but it’s also quite annoying. It’s easier and just as efficient to generally disable HTML / image display in eMails. Then only enable it for trusted sources.

Hope this answers your question. :)

Reply

Murray Carte

Never asume you are safe – I remeber visiting my cousins factory. He assumed his production and admin computers were safe, they were on a network, not on the internet. However his sales guy often brought his infected laptop into the office and connected to share files or printers. Every computer there was infected with something.

Reply

WendyElf

At my school we teach our 11 year olds as much as we can re. internet safety (especially regarding social media sites – we have just discovered that many of our 9/10/11 yr old pupils have facebook accounts). I feel it is VERY important they are taught internet awareness – and yes, I agree some schools aren’t adapting quickly enough to the electronic age. In my school, I am the only one passionate about ICT – and I have found it is not just my task to teach the children these things, but the teachers too. Most are not computer savvy, and have not had the time, training, interest or understanding to keep abreast of what is going on – they are already so overworked and drowning in often senseless paperwork I am surprised many of them have not imploded….
Personally too, I really do believe that kids brought up now in this digital age are working their brains in far different ways than my generation experienced – the full effects of which we will not see until they are adults.
Elvin – our primary school teaches more than ‘useless stuff’…. trust me…. :). Teaching them tools and concepts yes, but also, how to achieve their full potential as alive, aware, responsible human beings, and how to live on this planet and treat it, and each other, with respect and humanity. (Then hopefully how to set up a blog and write about their experiences!!! Hahahaha)

Reply

Nibir Farhan

Thanks a lot for your useful article. I am using internet for almost two years and I didn’t even know about macro viruses. I always used to open .doc attachment without any hesitations thinking this wouldn’t contain any virus. but not from now on. I also didn’t have much idea about html virus that you have mentioned. Many like me will certainly be benefited from this article. good job

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