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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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World map of 24-hour relative average utilization of IPv4 addresses observed using ICMP ping requests by Carna botnet, June - October 2012. The Carna botnet was a botnet of 420,000 devices created by an anonymous hacker to measure the extent of the Internet in what the creator called the “Internet Census of 2012”.
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 Mariposa botnet, discovered December 2008, [1] is a botnet mainly involved in cyberscamming and denial-of-service attacks. [2] [3] Before the botnet itself was dismantled on 23 December 2009, it consisted of up to 12 million unique IP addresses or up to 1 million individual zombie computers infected with the "Butterfly (mariposa in Spanish) Bot", making it one of the largest known botnets.
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.
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 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]