We now know that attacks of modern Web sites are usually automated because armies of robots knock on doors until they inevitably find vulnerabilities and take advantage of them. PerimeterX, a San Francisco startup, wants to protect sites against these automated attacks. Today, he announced a C $ 43 million series.

The round was led by Scale Venture Partners. New investor, Adams Street Partners has joined existing investors, Canaan Partners, Vertex Ventures and Data Collective. Ariel Tseitlin, a Scale partner, will join the company's board of directors under the terms of the agreement. Today's investment brings the total amount raised to more than $ 77 million, according to Crunchbase data.

Omri Iluz, co-founder and CEO of PerimeterX, explains that bots have become the hackers' favorite way to attack websites and mobile apps, and that his company has developed a way to defend against this type of malware. approach. It uses an approach called a behavioral fingerprint to mitigate these automated attacks.

"Once we have gained visibility into the behavior of the user, we are able to distinguish between normal behavior and abnormal behavior that seems to come from an automated tool," he said. -he declares. The solution examines attributes such as mouse movements and slips. It also analyzes the hardware to understand the graphics driver and audio driver of any device that the bot is supposed to be.

To achieve this type of identification, you need huge amounts of data. PerimeterX uses machine learning to better understand normal behavior and to stop abnormal behavior in an automated way.

The company was founded in 2014 and currently has 140 employees. Ariel Tseitlin of Scale Venture Partners, whose firm is at the top of the rankings, says that when companies reach this level of maturity, Series C funds tend to be used in sales and marketing to increase revenue and resize the society.

"Although R & D offers many opportunities, most of the money is usually spent on sales and marketing. It is therefore better to hire more salespeople and more marketers. This is largely the source of the expansion, which tends to be quite closely tied to income growth and quite closely to stronger growth in general, "said Tseitlin.

Last week, we talked about funding for Signal Sciences, a company that is also working to protect web applications by using a firewall. Iluz says that the two companies often work with the same customers, rather than competing with each other because they tackle the problem differently.