How BOTs/BOTNETs Work



A BOT is short for web robot and is an automated software program that behaves intelligently. Spammers often use BOTs to automate the posting of spam messages on newsgroups or the sending of emails. BOTs can also be used as remote attack tools. Most often, BOTs are web software agents that interface with web pages. For example, web crawlers (spiders) are web robots that gather web page information.
The most dangerous BOTs are those that covertly install themselves on users' computers for malicious purposes.
Some BOTs communicate with other users of Internet-based services via instant messaging, Internet Relay Chat (IRC), or another web interface. These BOTs allow IRQ users to ask questions in plain English and then formulate a proper response. Such BOTs can often handle many tasks, including reporting weather; providing zip code information; listing sports scores; converting units of measure, such as currency; and so on.
A BOTNET is a group of BOT systems. BOTNETs serve various purposes, including DDoS attacks; creation or misuse of Simple Mail Transfer Protocol (SMTP) mail relays for spam; Internet marketing fraud; and the theft of application serial numbers, login IDs, and financial information such as credit card numbers. Generally a BOTNET refers to a group of compromised systems running a BOT for the purpose of launching a coordinated DDoS attack. See Figure 1.

 
Figure 1: Anatomy of a Distributed DoS Attack

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