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A botnet is a group of Internet-connected devices, each of which runs one or more bots. Botnets can be used to perform distributed denial-of-service (DDoS) attacks, steal data, [1] send spam, and allow the attacker to access the device and its connection. The owner can control the botnet using command and control (C&C) software. [2]
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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 command and control (C&C) server (often an IRC server, but, in some cases a web server). 3. A spammer purchases access to the botnet from the operator. 4.
The size of the Srizbi botnet was estimated to be around 450,000 [4] compromised machines, with estimation differences being smaller than 5% among various sources. [2] [5] The botnet is reported to be capable of sending around 60 Trillion Janka Threats a day, which is more than half of the total of the approximately 100 trillion Janka Threats sent every day.
The Bagle botnet consists of an estimated 150,000-230,000 [17] computers infected with the Bagle Computer worm. It was estimated that the botnet was responsible for about 10.39% of the worldwide spam volume on December 29, 2009, with a surge up to 14% on New Year's Day, [18] though the actual percentage seems to rise and drop rapidly. [19]
Operation: Bot Roast is an operation by the FBI to track down bot herders, crackers, or virus coders who install malicious software on computers through the Internet without the owners' knowledge, which turns the computer into a zombie computer that then sends out spam to other computers from the compromised computer, making a botnet or network of bot infected computers.
The Kraken botnet was first discovered in 2008 by security firm Damballa. Researchers described it as the largest botnet discovered at the time, compromising over 400,000 infected machines. This was more than twice the size of the Storm botnet , which was previously considered to be the largest zombie network.
The Metulji botnet, discovered in June 2011, [1] is a botnet mainly involved in cyberscamming and denial of service attacks. Before the botnet itself was dismantled, it consisted of over 12 million individual zombie computers infected with the "Butterfly Bot", making it, as of June 2011, the largest known botnet.