The Department of Justice has indicted seven people for allegedly hijacking millions of computers, manipulating traffic on popular websites, and generating more than $14 million in fraudulent advertising revenue.

The defendants — six Estonians and one Russian — allegedly hijacked more than 4 million computers using malware that rerouted Internet traffic to websites where they would get a cut of the ad revenue. Infected computers with users looking for popular websites such as Netflix, Amazon, and iTunes were rerouted to webpages that featured the defendants’ ads.…