How Computer Viruses Travel by Email

in Tips & Tricks on February 14, 2019

To prevent the spread of viruses in your computer systems, it is important to be careful not to click on links, attachments or banners that come from an email address that you do not know the sender.

How viruses travel by email.

Here’s an explanation of how a virus can end up spreading through your email, with your unwitting cooperation:

  1. You receive what seems to be an innocent-looking email from someone you know well (or at least know by name). The email will include an attachment that seems to go with the message of the email—if the message says something about a picture or video you have to see, the picture will have a name that seems to fit. If you open it up, you’re on your way to trouble.
  2. If there’s a virus hidden in that email, it’s usually one of a few types:
    • An attachment virus is a program attached to an email message, with a name that sounds intriguing. It pretends to be a photo or movie that you can watch right away. This is the most common type of virus.
    • An HTML virus is called “active content code” and is a small program written in a software language such as JavaScript or ActiveX. The HTML virus goes to work when you open the message to read it. In fact, the virus can be launched even if you simply open the message preview window.
    • A Multipurpose Internet Mail Extension virus (called a MIME virus) takes advantage of a security gap in browsers or email programs. It’s somewhat complicated—let’s just say the bad guy overloads what’s called the email “header” with information. The overflow information, instead of being discarded, goes into the memory to run programs. The virus program then gets run instead, unnoticed.

These are often e-mails in English that speak of balances to be paid, transfer of money to be made or information to update, and which come from e-mail addresses that you do not know, or whose content you think is suspicious .

Here is an example :

Hello (your name and surname),

I have paid the outstanding balance today by bank transfer – $ 1215.92. Please see your address, please update your records.

A link to click here

Also note that banking institutions never ask for personal information by email, so if you receive a message from your institution (which claims to be your institution) asking for information, be vigilant; Do not open any attachments or click on any links contained in this email.

These few precautions will help you avoid a lot of trouble later.

Categories: Tips & Tricks