A botnet is a number of Internet computers that have been set up to send transmissions like spams or viruses to other computers through the Internet, causing it to fail. It is also the group of Internet connected programs for communication purposes. These compromised botnet computers are usually referred to as a zombie. It is still a big problem and threat to the Internet world.
The
picture above shows how a botnet is used to send spam email. The first step
shows that a user sends out viruses to other users’ computer through Internet.
The “bot” then infects the computer and eventually a spammer buys the services
of the botnet from the original user/operator. Then the last step shows through
using the control panel on the web server, they send out spam messages.
Zombie is
referred to an infected computer, covertly taken over, to practice mal-task. The
botnets of zombie computers are used to spread spam emails and failure of
service. Again, it is very covertly taken so that the most of the owners would
not able to know how their computers are used in this way.
This video talks briefly about what botnet is.
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