However, computer viruses are small programs.
They expand by attaching a copy of themselves to another program.
Once attached to the host program, the viruses then look for other programs to "infect".
In this way, the virus can spread quickly throughout a hard disk
Once attached to the host program, the viruses then look for other programs to "infect".
In this way, the virus can spread quickly throughout a hard disk
or an entire organization when it infects a LAN or a multi-user system.
The timing of the attack can be linked to a number of situations,
or an entire organization when it infects a LAN or a multi-user system.
The timing of the attack can be linked to a number of situations,
including a certain time or date, the presence of a particular file,
the security level of the user, and the number of times a file is used.
including a certain time or date, the presence of a particular file,
the security level of the user, and the number of times a file is used.
Likewise, the mode of attack varies.
So-called "benign" or the harmless viruses might simply display a message,
Likewise, the mode of attack varies.
So-called "benign" or the harmless viruses might simply display a message,
like the one that infected IBM's main computer system last Christmas with a season's greeting.
Malignant or the harmful viruses are designed to damage the system.
like the one that infected IBM's main computer system last Christmas with a season's greeting.
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