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Discribtion About Botnet

A botnet is a collection of internet-connected programs communicating with other similar programs in order to perform tasks. This can be as mundane as keeping control of an IRC channel, or it could be used to send spam email or participate in DDoS attacks. The word botnet stems from the two words robot and network.

Legal botnets

The term bot net is widely used when several IRC bots have been linked and may possibly set channel modes on other bots and users while keeping IRC channels free from unwanted users. This is where the term is originally from, since the first illegal botnets were similar to legal botnets. A common bot used to set up botnets on irc is eggdrop.

Illegal botnets

Botnets sometimes comprise computers whose security defenses have been breached and control ceded to a 3rd party. Each such compromised device, known as a "bot", is created when a computer is penetrated by software from a malware (malicious software) distribution. The controller of a botnet is able to direct the activities of these compromised computers through communication channels formed by standards-based network protocols such as IRC (Internet Relay Chat) and HTTP (Hypertext Transfer Protocol).

Formation and exploitation

This example illustrates how a botnet is created and used to send email spam.

How a botnet works
  1. A botnet operator sends out viruses or worms, infecting ordinary users' computers, whose payload is a malicious application—the bot.
  2. The bot on the infected PC logs into a particular C&C server.
  3. A spammer purchases the services of the botnet from the operator.
  4. The spammer provides the spam messages to the operator, who instructs the compromised machines via the control panel on the web server, causing them to send out spam messages.
Botnets are exploited for various purposes, including denial-of-service attacks, creation or misuse of SMTP mail relays for spam (see Spambot), click fraud, spamdexing and the theft of application serial numbers, login IDs, and financial information such as credit card numbers.
The botnet controller community features a constant and continuous struggle over who has the most bots, the highest overall bandwidth, and the most "high-quality" infected machines, like university, corporate, and even government machines.

Different Types of Bots with downloads:

  1.  Agobot/Phatbot/Forbot/XtremBot

  2. SDBot/RBot/UrBot/UrXBot/...

  3. mIRC-based Bots - GT-Bots

  4.  DSNX Bots

  5. Q8 Bots

  6. kaiten

  7. Perl-based bots     

     enjoy this tutorial in next tutorial i will tell you how to use bots and from where you can get all this bots , for more details just post your comment and give feed back so that i will improve more . 

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