Ways That Computer Viruses Spread

Ways That Computer Viruses Spread



Ways That Computer Viruses Spread
For a​ virus or​ similar program to​ have any great impact it​ needs to​ be able to​ spread from one machine to​ another .​
They are specifically designed to​ get access to​ parts of​ your computer system that allow for communication with other machines .​
Below is​ a​ discussion of​ some of​ the​ most common methods.
Boot Infectors
Every disk (hard disk,​ floppy,​ CD,​ DVD) contains a​ boot sector whether it​ is​ a​ bootable disk or​ not .​
When a​ computer is​ turned on,​ it​ looks for boot information .​
If the​ computer finds a​ disk with boot information,​ it​ reads that information and uses it​ to​ properly start the​ computer .​
If for some reason that boot information is​ infected with a​ virus,​ the​ virus is​ activated and possibly transferred to​ the​ computer's hard drive (if the​ infection was on​ a​ CD for example) .​
Once the​ boot code on​ the​ hard drive is​ infected the​ virus will be loaded into your computer's memory every time you start your computer .​
From memory the​ boot virus can travel to​ any and every disk that is​ put into your computer .​
This is​ how the​ infection spreads .​
Most boot viruses could be on​ a​ system for a​ long time without causing problems,​ simply existing there to​ spread themselves .​
Often such viruses are designed to​ activate their bad behaviour on​ a​ specific date (Halloween for example) .​
There are some nasty boot viruses that will destroy the​ boot information or​ force a​ complete format of​ the​ hard drive immediately after they get into a​ computer.
Program Infectors
When an​ infected application is​ run the​ virus activates and is​ loaded into memory .​
While the​ virus is​ in​ memory any new program file that you run can become infected .​
This means that there will be increasingly more applications on​ your system that are infected .​
Multiple infections are very common and will certainly cause system problems .​
Program files may function without any problems for some time but eventually they will have problems or​ multiple infections brings the​ entire computer system down .​
The data the​ program produces may be a​ first sign of​ infection such as​ saving files without proper names,​ or​ with incorrect/incomplete data being saved.
Viruses of​ this type are often designed to​ seek out programs that are used to​ share information between users/computers such as​ email applications,​ screen savers,​ office document Macros,​ and self-extracting compressed files.
Through e-mail attachments
Many of​ the​ most dangerous viruses are primarily spread through e-mail attachments - files that can be sent along with an​ e-mail message .​
In such cases,​ the​ user of​ an​ infected computer unknowingly attaches an​ infected file to​ an​ email message,​ and then sends the​ email to​ a​ friend or​ colleague .​
When the​ email is​ received,​ the​ virus is​ launched when the​ file attachment is​ opened,​ thus infecting a​ new computer .​
Email messages with animations,​ automated greeting cards,​ jokes,​ photographs,​ spreadsheet and document files,​ all have been documented to​ contain virus files.
More and more frequently these days mass mailing email worms/viruses are being released .​
These attacks AUTOMATICALLY scan your computer's files for any email address it​ can find and then uses your email application to​ AUTOMATICALLY send infected messages to​ any email address found in​ any file on​ your computer (not just email message files).
It is​ important to​ be aware of​ the​ emails that you open to​ make sure that they do not contain harmful viruses .​
Even emails from family and friends could have a​ virus,​ if​ that person's computer is​ infected .​
This is​ where an​ anti-virus software would be really helpful in​ detecting if​ there is​ a​ virus in​ any incoming messages.




You Might Also Like:




No comments:

Powered by Blogger.