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Trojan Subtle Techniques to Hijack Search Results and Generate Income
This trojan does not add any new registry entries. The existent netcfgx.dll one is modified to load netcfgx.dll:Zone.Identifier instead. Upon execution, two kernel drivers are extracted, installed and then deleted. One is used to hide the infection, while the other is employed to inject the payload into the process memory of Internet Explorer and Firefox.
The click fraud is performed by redirecting legit Google search queries through a custom Google search widget created by the attackers. Google Custom Search with AdSense is a legit way for webmasters to generate income by integrating a Google-sponsored search box into their websites. Results to queries performed through these custom search boxes are accompanied by advertisements.
Webmasters receive a fee for every click on the ads displayed along search results, and this is exactly what the cybercriminals want with this attack. "The user never notices any change in their web-surfing experience," Joe Stewart, director of malware analysis, explains, while also noting that Google might also have trouble tracking this sort of fraud.
The trojan's code suggests that Yahoo! Search is also targeted, but researchers note that they haven't been able to trigger a successful attack that redirected search.yahoo.com through a third-party search widget.
"As click-fraud trojans go, this is one of the more clever that we've seen," the Websense analysts conclude. "FFSearcher undoubtedly raises the bar for the fraud detection teams working at the major search engines, and it will be interesting to see how they combat it and other trojans using the same technique in the future," they add.
This Spyware Threat taken from here!
If you'd like to see even more on this check out this BBC video - on how cybercriminals attack websites.
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