Exploit kit activity up 75 percent in third quarter 2015

Maria Korolov

"They're doing a better job marketing, packaging and keeping their code up to date," Rasmussen said.

Some exploit kits are even distributed in a software-as-a-service model. To keep authorities from shutting down the sites, each customer gets their own domain where the service is hosted.

The buyers use the exploit kits to send out spam, run malvertising campaigns, distribute ransomware, and other nefarious activities.

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