Malicious digital advertisements and “SEO poisoning” that gets those ads to prime spots in search results have been mainstays of the digital scamming ecosystem for years. But as online crime evolves and malicious trends like “pig butchering” investment scams and infostealing malware proliferate, researchers say that so-called “malvertising” is still a key technique for scammers—and still a growing problem.Instances of malvertising in the US were up 42 percent month-over-month in fall 2023 and in...