Integral Ad Science is unveiling some new steps to combat ad fraudsters, including the acquisition of a bot detection company called Swarm.

CEO Scott Knoll told me that he was particularly interested in Swarm’s technology for side channel analysis, a technique for examining a web browser to identify whether or not it’s a bot. That’s an area where Integral Ad Science has already developed its own technology, but Knoll said its approach is “complementary” with Swarm’s.

“For the last 18 months, we’ve been kicking the tires on a lot of technologies out there in side channel analysis,” he said. “We’re really excited, because this combined with our side channel analysis and our unique big data capabilities will give us a huge advantage.”

Knoll added that the Swarm team will continue to operate out of their offices in San Francisco. The financial terms of the acquisition are not being disclosed.

In the meantime, the Integral Ad Science team has also been busy doing more of its own research on identifying bots. The big theme, Knoll said, is that fraudsters are changing bot behavior as advertisers start looking at different metrics. They broad aim is the same — tricking advertisers into paying for fake ad impressions — but they’re no longer limited to just loading up or clicking on an ad.

“They’re getting really sophisticated, in the sense that they’re hard to detect,” Knoll said. “These bots are trying to success metrics around viewability, attention metrics … like scroll rates or hover rates.”

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