 - A botnet (also known as a zombie army) is a number of Internet computers that, although their owners are unaware of it, have been set up to forward transmissions (including spam or viruses) to other computers on the Internet. Any such computer is referred to as a zombie - in effect, a computer "robot" or "bot" that serves the wishes of some master spam or virus originator. Most computers compromised in this way are home-based. According to a report from Russian-based Kaspersky Labs, botnets -- not spam, viruses, or worms -- currently pose the biggest threat to the Internet. A report from Symantec came to a similar conclusion.
Computers that are coopted to serve in a zombie army are often those whose owners fail to provide effective firewalls and other safeguards. An increasing number of home users have high speed connections for computers that may be inadequately protected. A zombie or bot is often created through an Internet port that has been left open and through which a small Trojan horse program can be left for future activation. At a certain time, the zombie army "controller" can unleash the effects of the army by sending a single command, possibly from an Internet Relay Channel (IRC) site.
The computers that form a botnet can be programmed to redirect transmissions to a specific computer, such as a Web site that can be closed down by having to handle too much traffic - a distributed denial-of-service (DDoS) attack - or, in the case of spam distribution, to many computers. The motivation for a zombie master who creates a DDoS attack may be to cripple a competitor. The motivation for a zombie master sending spam is in the money to be made. Both of them rely on unprotected computers that can be turned into zombies.
According to the Symantec Internet Security Threat Report, through the first six months of 2006, there were 4,696,903 active botnet computers.
| LAST UPDATED: |
06 Aug 2007
|
 |
Read more about botnet:
|
|
Do you have something to add to this definition? Let us know.
Send your comments to techterms@whatis.com
|
 |
 |
| |
RELATED GLOSSARY TERMS
| Terms from Whatis.com − the technology online dictionary |
 |
bot worm
(SearchSecurity.com)
A bot worm is a self-replicating malware program that resides in current memory, turns infected computers into zombies (or bots) and transmits itself...
|
|
directory traversal
(SearchSecurity.com)
Directory traversal is a form of HTTP exploit in which a hacker uses the software on a Web server to access data in a directory other than the...
|
|
|
