Malwarebytes: Malicious ads served as many as a billion harmful ads across the web. The ads relied on redirecting users to scammy sites and trying to social engineer them. The group created 28 fraudulent ad agencies and took time to build each one’s social media profile to make them appear legitimate. Confiant estimates 62 percent of websites that are monetized through advertising may have served up Zirconium’s bad ads. The report appears to have caused the group to either disappear or better cover its tracks.”]
Source: https://www.cuinfosecurity.com/online-advertising-hackers-little-helper-a-10605