Menu
Estonian man gets over 7 years in prison for role in global DNS hijacking botnet

Estonian man gets over 7 years in prison for role in global DNS hijacking botnet

Vladimir Tsastsin was one of seven individuals behind a $14 million click fraud operation that used the DNSChanger botnet

An Estonian man has been sentenced to seven years and three months in prison in the U.S. for his role in a cybercriminal operation that infected over 4 million computers with DNS hijacking malware.

Vladimir Tsastsin, 35, from Tartu, Estonia, was one of the key players in a US$14 million click fraud scheme. He is the sixth individual to be sentenced in the case and has received the longest prison sentence. The sentence was handed down Tuesday in U.S. District Court for the Southern District of New York.

According to the Department of Justice, between 2007 and 2011, Tsastsin and his co-conspirators set up companies that masqueraded as publisher networks and entered into agreements with advertising brokers to display ads on their properties.

In order to earn more money, the group artificially increased the number of user clicks and views for the ads they displayed by installing a malware program called DNS Changer on unsuspecting users' computers.

It's estimated that DNSChanger infected over 4 million computers worldwide, including 500,000 in the U.S., before its operation was shut down by the FBI.

As its name implies, the DNSChanger malware altered the computer's DNS (Domain Name System) settings, forcing them to use DNS resolvers run by the attackers.

The DNS is the Internet's phonebook, translating domain names into numerical Internet Protocol (IP) addresses that computers use to communicate. By controlling the DNS servers used by infected computers, the attackers could point users to other websites when they wanted to reach specific domain names. This capability was used to perform click fraud.

Tsastsin and his co-conspirators used DNSChanger to redirect users who clicked on links in search results to websites that they didn't intend to visit. They also replaced the advertisements that users should have normally seen on various websites with ads for which they were being paid.

While DNS hijacking was used for click fraud in this case, the technique is very powerful and can be used for more serious attacks against users, such as phishing.

For example, when asked for an online banking website's IP address, a rogue DNS server could respond with the address of a Web server hosting a rogue copy of the website. Despite this, the domain name showing up in the user's browser would be the correct one, making it hard to tell that a phishing attack was in progress.

This kind of attack happened in 2014 in Poland, but instead of using malware to change the DNS settings of individual computers, the attackers compromised home and small business routers and changed the DNS settings for entire networks.

Most computers and mobile devices are configured to automatically obtain their Internet connection settings from the router serving the network they're connected to. This makes routers an attractive target for DNS hijacking attacks.

Over the past several years security researchers have observed many large-scale attacks designed to change the DNS settings on routers, either by exploiting vulnerabilities in their firmware or by hijacking users' browsers when they visited compromised websites.

Router owners should periodically check their device manufacturer's website for firmware updates and install them, especially if they contain security fixes. They should also change the default administrator password on their routers and make sure to always log out from the router's management interfaces after accessing it through a browser.

Follow Us

Join the New Zealand Reseller News newsletter!

Error: Please check your email address.

Featured

Slideshows

Arrow exclusively introduces Tenable Network Security to A/NZ channel

Arrow exclusively introduces Tenable Network Security to A/NZ channel

Arrow Electronics introduced Tenable Network Security to local resellers in Sydney last week, officially launching the distributor's latest security partnership across Australia and New Zealand. Representing the first direct distribution agreement locally for Tenable specifically, the deal sees Arrow deliver security solutions directly to mid-market and enterprise channel partners on both sides of the Tasman.

Arrow exclusively introduces Tenable Network Security to A/NZ channel
Examining the changing job scene in the Kiwi channel

Examining the changing job scene in the Kiwi channel

Typically, the New Year brings new opportunities for personnel within the Kiwi channel. 2017 started no differently, with a host of appointments, departures and reshuffles across vendor, distributor and reseller businesses. As a result, the job scene across New Zealand has changed - here’s a run down of who is working where in the year ahead…

Examining the changing job scene in the Kiwi channel
​What are the top 10 tech trends for New Zealand in 2017?

​What are the top 10 tech trends for New Zealand in 2017?

Digital Transformation (DX) has been a critical topic for business over the last few years and IDC is now predicting a step change as DX reaches macroeconomic levels. By 2020 a DX economy will emerge and it will become the core of what New Zealand industries focus on. From the board level through to the C-Suite, Kiwi organisations must be prepared to think and act digital when the DX economy emerges in 2017.

​What are the top 10 tech trends for New Zealand in 2017?
Show Comments