Malware-infected computers are increasingly being used to perpetrate click fraud, according to a study released Thursday that found their contribution was the highest since researchers began compiling statistics on the crime.

In the third quarter of this year, 42.6 percent of fraudulent clicks were generated by computers that were part of botnets, compared with 36.9 percent the previous quarter and about 27.6 percent in the same period of 2008. The increase comes as criminals trying to profit from click fraud take advantage of new advances in malware that make the practice harder to detect.

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