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Srizbi botnet
The Srizbi botnet, also known by its aliases of Cbeplay and Exchanger, is the world's largest or second-largest botnet depending on expert reports, and is responsible for sending out more than half of all the spam being sent by all the major botnets combined.〔 〕 The botnets consist of computers infected by the Srizbi trojan, which sends spam on command. The botnet suffered a significant setback in November 2008 when hosting provider McColo was taken down; global spam volumes reduced by up to 75% as a result of this action.
== Size ==
The size of the Srizbi botnet is estimated to be around 450,000 compromised machines, with estimation differences being smaller than 5% among various sources.〔 The botnet is reported to be capable of sending around 60 billion spam messages a day, which is more than half of the total of the approximately 100 billion spam messages sent every day. As a comparison, the highly publicized Storm botnet only manages to reach around 20% of the total amount of spam sent during its peak periods.〔
The Srizbi botnet is showing a relative decline after an aggressive growth in the amount of spam messages sent out in mid-2008. As of 13 July, the botnet is believed to be responsible for roughly 40% of all the spam on the net, a sharp decline from the almost 60% share in May.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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