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Friday, December 06, 2013
Microsoft, the FBI, Europol Disrupt ZeroAccess Botnet

Microsoft said on Thursday it had disrupted the largest network of compromised personal computers, involving some 2 million machines around the world.

The Microsoft Digital Crimes Unit has disrupted the The Sirefef botnet, also known as ZeroAccess, in collaboration with Europol's European Cybercrime Centre (EC3), the Federal Bureau of Investigation (FBI) and companies including A10 Networks Inc.

The botnet was targeting search results on Google, Bing and Yahoo search engines, and is estimated to cost online advertisers $2.7 million each month.

This is Microsoft's first botnet action since the Nov. 14 unveiling of its new Cybercrime Center.

Due to its botnet architecture, ZeroAccess is one of the most robust and durable botnets in operation today and was built to be resilient to disruption efforts, relying on a peer-to-peer infrastructure that allows cybercriminals to remotely control the botnet from tens of thousands of different computers. ZeroAccess is used to commit a slew of crimes, including search hijacking, which "hijacks" people's search results and redirects people to sites they had not intended or requested to go to in order to steal the money generated by their ad clicks. ZeroAccess also commits click fraud, which occurs when advertisers pay for clicks that are not the result of legitimate, interested human users' clicks, but are the result of automated Web traffic and other criminal activity. Research by the University of California, San Diego shows that as of October 2013, 1.9 million computers were infected with ZeroAccess, and Microsoft determined there were more than 800,000 ZeroAccess-infected computers active on the Internet on any given day.

Last week, Microsoft filed a civil suit against the cybercriminals operating the ZeroAccess botnet and received authorization from the U.S. District Court for the Western District of Texas to simultaneously block incoming and outgoing communications between computers located in the U.S. and the 18 identified Internet Protocol (IP) addresses being used to commit the fraudulent schemes. In addition, Microsoft took over control of 49 domains associated with the ZeroAccess botnet. A10 Networks provided Microsoft with advanced technology to support the disruptive action.

As Microsoft executed the order filed in its civil case, Europol coordinated a multijurisdictional criminal action targeting the 18 IP addresses located in Europe. Specifically, Europol worked with Latvia, Luxembourg, Switzerland, the Netherlands and Germany to execute search warrants and seizures on computer servers associated with the fraudulent IP addresses located in Europe.

Microsoft and its partners do not expect to fully eliminate the ZeroAccess botnet due to the complexity of the threat. However, Microsoft expects that this action will significantly disrupt the botnet's operation. Microsoft is working with ecosystem partners around the world to notify people if their computers are infected and will make this information available through its Cyber Threat Intelligence Program (C-TIP). ZeroAccess is very sophisticated malware, blocking attempts to remove it, and Microsoft therefore recommends that people visit for detailed instructions on how to remove this threat. Because Microsoft found that the ZeroAccess malware disables security features on infected computers, leaving the computer susceptible to secondary infections, it is critical that victims rid their computers of ZeroAccess by using malware removal or antivirus software as quickly as possible.

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