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Zeus (malware)
Zeus, ZeuS, or Zbot is a Trojan horse malware package that runs on versions of Microsoft Windows. While it can be used to carry out many malicious and criminal tasks, it is often used to steal banking information by man-in-the-browser keystroke logging and form grabbing. It is also used to install the CryptoLocker ransomware. Zeus is spread mainly through drive-by downloads and phishing schemes. First identified in July 2007 when it was used to steal information from the United States Department of Transportation, it became more widespread in March 2009. In June 2009 security company Prevx discovered that Zeus had compromised over 74,000 FTP accounts on websites of such companies as the Bank of America, NASA, Monster.com, ABC, Oracle, Play.com, Cisco, Amazon, and ''BusinessWeek''.
== Detection and removal ==
Zeus is very difficult to detect even with up-to-date antivirus and other security softwares as it hides itself using stealth techniques. It is considered that this is the primary reason why the Zeus malware has become the largest botnet on the Internet: some 3.6 million PCs are said to be infected in the U.S. alone. Security experts are advising that businesses continue to offer training to users to teach them to not to click on hostile or suspicious links in emails or Web sites, and to keep antivirus protection up to date. Antivirus software does not claim to reliably prevent infection; for example Browser Protection says that it can prevent "some infection attempts".〔(【引用サイトリンク】title=Trojan.Zbot )〕
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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