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Apparently the FBI put a warning out that cyber criminals are abusing search engine ad systems by impersonating legitimate companies in order to steal people's credentials and whatnot.
Stuff like this is one of the reasons I use an ad blocker in the first place. If various mainstream sites did a better job in vetting their ads and didn't bombard us with them when visiting a site there would be less of a need for them. Just use the YouTube app if you want a demonstration of this.
That's not exactly how it works. While malvertising is real and ad blockers effective, the 'new' issue is bad guys are using legitimate ad services as redirect links and emailing them to people. By using ad service redirects, security software see the link as legitimate because ad companies are big business. Those links will not be blocked by security software. You won't even know it's a malicious link unless you look at the link code itself because the real link is obfuscated. It's devious. 😒