Computer Virus
Computer
Virus
A virus or worm is a computer program that can spread across computer
and networks by making copies of itself, usually without
user’s knowledge
Viruses can have harmful effects. These can range from displaying irritating to stealing data or giving other users control over your computer.
How can virus infect computers...?
A virus program has to be run before it can infect your computer.
Viruses have ways of making sure that this happens. They can
attach-themselves to other program or hide in code that is run
automatically when you open certain types of files. Sometimes they
can exploit security flaws in your computer’s operating system to run
and to spread themselves automatically
You might receive an infected file in a email attachment, in
a download from the internet, or on a disk. As soon as the file is
launched, the virus code runs. Then the virus can copy itself to other
file or disk and make changes on your computer.
1.)
Trojan horses
but actually carry
out hidden, harmful functions.
For example, DLoader-L arrives in an email attachment and claims
to be an urgent update from Microsoft for Windows XP. If you run
it, it downloads a program that uses your computer to connect to
overload them (this is called a
denial-of-service attack).
Trojans cannot spread as fast as viruses because they do not
make copies of themselves. On the other hand, some Trojans are
used as a means of infecting a computer with a virus.
2.) Worms
Worms are similar viruses but do not need carrier programs or
document. Worms simply create exact copies of themselves and use
communication between computers to spread. Many viruses, such as
MyDoom or Bagle , behave like worms and use email to forward
themselves.
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