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A botnet is an interconnected network of computers infected with malware without the user's knowledge and controlled by cybercriminals. They're typically used to send spam emails, transmit viruses and engage in other acts of cybercrime. Sometimes known as a zombie army, botnets are often considered one of the biggest online threats today.
The word Botnet is formed from the words ‘robot’ and ‘network’. Cybercriminals use special Trojan viruses to breach the security of several users’ computers, take control of each computer, and organize all of the infected machines into a network of ‘bots’ that the criminal can remotely manage.
Often, the cybercriminal will seek to infect and control thousands, tens of thousands or even millions of computers – so that the cybercriminal can act as the master of a large ‘zombie network’ – or ‘bot-network’ – that is capable of delivering a Distributed Denial of Service (DDoS) attack, a large-scale spam campaign or other types of cyberattack.
In some cases, cybercriminals will establish a large network of zombie machines and then sell access to the zombie network to other criminals – either on a rental basis or as an outright sale. Spammers may rent or buy a network in order to operate a large-scale spam campaign.
Installing effective anti-malware software will help to protect your computer against Trojans and other threats.
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