Computer virus is a computer program that can copy itself and infect your computer automatically. Virus can come from every way. It does not mean if you are not connecting to internet your computer will not affected by virus. For examples, when you are using your pendrive, mp3 or anything that enable you to copy something from one computer to your computer, that mean your computer have a probability to be affected by virus. However, in my opinion, email is a medium that is more easily make your computer affected by virus.
As stated above, the term "computer virus" is sometimes used as a catch-all phrase to include all types of malware, even those that do not have the reproductive ability. Malware includes computer viruses, computer worms, Trojan horses, spyware, other malicious and unwanted software, including true viruses.
Viruses are sometimes confused with worms and Trojan horses, which are technically different. Let me tell you what is the different between them^^
Worms it can exploit security exposures to spread itself automatically to other computers through networks.
Trojan horse is a program that appears harmless but hides malicious functions.
Worms and Trojan horses, like viruses, may harm a computer system's data or performance. Some viruses and other malware have symptoms noticeable to the computer user, but many are surreptitious or simply do nothing to call attention to them. Some viruses do nothing beyond reproducing themselves.
I believe that everyone hate with the existing of virus in your computer. In here I recommend some of the antivirus programs that I think it’s very good to preventing the virus come to find you~~
Norton Anti-Virus (i am currently using NAV and i think this is the most user friendliness and able to help me to fight with virus that is trying to visit to my computer. Most satisfied anti-virus program^^)
AVG
Kaspersky
Attention: all of you must beware of the attachments that come together with your email. Don’t try to open the attachments that you are not expecting because virus will come with some very nasty messages to trick you to open the attachment.
For example, “your Google account is going to expire, please see the attachment for details.”
Even worse, the virus looks like it comes from an email address you recognise e.g. from admin@yourDomain.com (where 'your domain' is the domain name that you use). Virus attachments can have the following 'file extension': .exe, .pif. If you receive a .zip attachment and open it - make sure it doesn't contain a file with one of those extensions. Do not open attachments you haven't requested, even if they appear to be from people you know.
Now, you may ask, “How the viruses spoof the from-address in my email?” after you read this situation, it will help you to understand how the viruses spoof the from-address your email.
- You have effective anti-virus software, so your computer is clean,
- You send an email to Fred,
- Now your email address is in Freds address book in his email software,
- Fred does not have effective anti-virus software, and his computer has a virus,
- The virus on Freds computer scans his address book for all of the email addresses on it,
- The virus sends email to every address on Freds address book,
- The virus emails do not say they are from Fred!, The virus pic another addresses from Fred's address book and puts it in the 'From field' in the outgoing email. The virus may combine the name from one address and the domain from another, creating a 'from address' that does not exist.
- These emails are received by other computers, which detect the virus (because they have good anti-virus software) and reject the email,
- When the receiving computer rejects the viruses email it sends an 'Undeliverable' to the sender e.g. something like 'Subject: /Delivery Notification: Delivery has failed'.
- But! The 'Undeliverable' note goes to the spoofed from address (not to Fred) e.g. the 'Undeliverable' note could be sent to you.
- Often there is no trace of Freds real address in the virus email or the 'Undeliverable' note, so you cannot tell whose infected computer is sending these emails.
As a conclusion, if you don’t want the virus give any trouble for you, please purchase and use the ORIGINAL anti-virus software. However, with original anti-virus it’s still not enough for you to fight with virus but you need to update your antivirus frequently^^
Thanks You~~
Information retrieved from:
http://www.news-medical.net/health/What-is-a-Virus.aspx
http://wordsandpeople.com/security/tips-to-prevent-computer-viruses.htm
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