Jerome Segura, a senior security researcher with Malwarebytes, was recently stumped by a cyberattack he was studying. It seemed to keep vanishing.

Segura often studies malvertising, which involves seeding ad networks with harmful online advertisements that then appear on websites, potentially delivering malware to a person’s computer.

It’s a particularly insidious type of attack, since a person merely has to view an advertisement to become infected if his or her computer has a software vulnerability. 

“We knew there was something different that malvertisers were doing,” said Segura in a phone interview Thursday.

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