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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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Diagram of a DDoS attack. Note how multiple computers are attacking a single computer. In computing, a denial-of-service attack (DoS attack) is a cyber-attack in which the perpetrator seeks to make a machine or network resource unavailable to its intended users by temporarily or indefinitely disrupting services of a host connected to a network.
In June 2009 it was estimated that the Cutwail botnet was the largest botnet in terms of the amount of infected hosts. Security provider MessageLabs estimated that the total size of the botnet was around 1.5 to 2 million individual computers, capable of sending 74 billion spam messages a day, or 51 million every minute, equal to 46.5% of the worldwide spam volume.
The operation, conducted jointly by the U.S. Department of Justice and the FBI, weeded out malicious Chinese software from a network or "botnet" of hundreds of compromised U.S. routers, both ...
The distributed denial-of-service (DDoS) attack was accomplished through numerous DNS lookup requests from tens of millions of IP addresses. [6] The activities are believed to have been executed through a botnet consisting of many Internet-connected devices —such as printers , IP cameras , residential gateways and baby monitors —that had ...
A fast-flux service network (FFSN) is a network infrastructure resultant of the fast-fluxed network of compromised hosts; the technique is also used by legitimate service providers such as content distribution networks (CDNs) where the dynamic IP address is converted to match the domain name of the internet host, usually for the purpose of load balancing using round-robin domain name system ...
BASHLITE is written in C, and designed to easily cross-compile to various computer architectures. [9]Exact capabilities differ between variants, but the most common features [9] generate several different types of DDoS attacks: it can hold open TCP connections, send a random string of junk characters to a TCP or a UDP port, or repeatedly send TCP packets with specified flags.