Click fraud investigator Click Forensics has released its pay-per-click fraud findings for the second quarter of 2008, showing the rate of fraud is holding at 16.2 percent (0.6 percent down from last quarter) but sophisticated Botnet attacks have grown to make up more than a quarter of all PPC fraud.
"Although click fraud rates were relatively unchanged in the second quarter, we found that the methods used to commit click fraud have become increasingly more sophisticated and difficult to detect," Click Forensics president Tom Cuthbert said.
"The threat from botnets is the biggest concern as they have grown to cause over one quarter of all click fraud. Online advertisers should be extra vigilant in watching for traffic from botnets in their search marketing campaigns."
Using its the Click Fraud Index over the past three years, Click Forensics has been monitoring more than 4,000 online advertisers and agencies to provide statistically significant industry PPC data across all the leading search engines. Q2 2008 was the first period that traffic from botnets was responsible for more than 25 percent of click fraud traffic.
Overall, this quarter's fraud rates are down slightly from the 16.3 percent rate reported for Q1 2008, but up from the 15.8 percent click fraud rate reported for the same quarter last year.
The highest percentage of click fraud outside North America came from China at 4.3 percent, Russia at 3.5 percent and France 3.2 percent.
According to Click Fraud, the Click Fraud Index is the first independent, third-party click fraud detection service.
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