How Does Computer Virus Spread?

Thanks for sharing valuable information.

I completely agree with you about How Does Computer Virus Spread and we should prevent from it. Thanks for sharing the great stuff.

Yes they do, open software and if a bug is there, will try to get in to anything opened. accounts don't mean anything. your system is software, and it (depends on what it is) take over your system. or at least disrupt programs.

Thanks.

Hello

• 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 pics another addresse 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 virused 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 can not tell who's infected computer is sending these emails.

Computer viruses usually spread in one of three ways: from removable media; from downloads off the Internet; and from e-mail attachments.

Although the Internet gets a bad rap as a source of viruses, you're no more likely to contract a virus from the Web than you are from packaged software. Still, scan everything you download, and update your antivirus software regularly.

E-mail is not the virus breeding ground it's made out to be, either. In fact, it's nearly impossible for a virus to be transmitted by plain-text e-mail. Most viruses can only spread via attachments — either rich-text e-mail or attached applications. Using antivirus software, scan attachments from people you know, and never open attachments from people you don't. If you're a Microsoft Outlook user, you can also select security preferences that keep e-mail-borne viruses from exploiting the close relationship between Outlook and the Windows operating system.



Thanks

Originally Posted by karimkayley

For a computer virus to spread through a computer system, or network, it must be activated. This means that the file that contains the virus must be opened, or executed in order for the virus to come to life. After it gets activated, these viruses look for certain programs to infect. The main and the important that you must note is that, all viruses seem to do well is duplicate themselves within the programs they find, and this is the main reason as to how they spread well.

There are a lot of effects that a virus can cause on your computer depends on how it has been programmed to spread. These / this programming can be one of two types: One is the resident and the other is the non-resident. The non-resident viruses are made up of two processes -one finds files on your computer to infect, and the other duplicates the virus.

Resident viruses are made up of only one process. The sole function is to duplicate itself throughout your computer. To perform this action, resident viruses are programmed to load into the computer's memory and the virus itself is activated every time you turn your computer on. This process continues as long as the system is on.

Regards,
Karim.
Thanks to L&C Sunshine Technology Services.

Originally Posted by cute34

Computer viruses usually spread in one of three ways: from removable media; from downloads off the Internet; and from e-mail attachments.
Although the Internet gets a bad rap as a source of viruses, you're no more likely to contract a virus from the Web than you are from packaged software. Still, scan everything you download, and update your antivirus software regularly.
E-mail is not the virus breeding ground it's made out to be, either. In fact, it's nearly impossible for a virus to be transmitted by plain-text e-mail. Most viruses can only spread via attachments — either rich-text e-mail or attached applications. Using antivirus software, scan attachments from people you know, and never open attachments from people you don't. If you're a Microsoft Outlook user, you can also select security preferences that keep e-mail-borne viruses from exploiting the close relationship between Outlook and the Windows operating system.



Thanks

Both are very useful information, Thank you very much for sharing.

Spread throughout a computer system or network, opened a file that contains a virus, the virus should be put to death or to life because the virus, which is engaged.

Mostly from Internet and USB.