But at least one industry flourished by the scare.

PureFunds ISE Cyber Security ETF (NYSE:HACK) spiked 4 percent Monday on 2 million traded shares — the fourth highest volume since the ETF’s November 2014 launch.

“On average I always look for HACK to trade in the hundreds of thousands, but never in the millions,” PureFunds’ Aidan O'Leary told Benzinga. “So, whenever we see something like that, the numbers really speak for themselves.”

The Contents Of The HACK Basket

HACK is a package of nearly 40 publicly traded cybersecurity firms, including some familiar names:

O’Leary finds value in each constituent but considers FireEye and its Mandiant Unit, a malware consultant for large-cap companies, particularly interesting amid recent security concerns.

“If you take a company like that, these guys literally are called in to look through all of the disaster and figure out what happened,” O’Leary said. “So, I think a company like them are going to be very interesting over the next few weeks as businesses continue to sift through the damage caused by the WannaCry virus.”

Risks Of Cyber Investments

While the attacks catalyze business, they alone aren’t enough to sustain it. The “emerging” nature and swift evolution of the cybersecurity market pose risks to industry investors, O’Leary said.

He advised investors to investigate and understand the specialties of the firms they buy into.

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