An anonymous reader quotes a report from Bleeping Computer: A group of cyber-criminals created 28 fake ad agencies and bought over 1 billion ad views in 2017, which they used to deliver malicious ads that redirected unsuspecting users to tech support scams or sneaky pages peddling malware-laden software updates or software installers. The entire operation -- codenamed Zirconium -- appears to have started in February 2017, when the group started creating the fake ad agencies which later bought ad views from larger ad platforms. These fake ad agencies each had individual websites and even LinkedIn profiles for their fake CEOs. Their sole purpose was to interface with larger advertising platforms, appearing as legitimate businesses. Ad security company Confiant, the one who discovered this entire operation, says ads bought by this group reached 62% of ad-monetized websites on a weekly basis. All in all, Confiant believes that about 2.5 million users who've encountered Zirconium's malicious ads were redirected to a malicious site, with 95% of the victims being based in the U.S.