If I were to ask if you could trust a script from Google that is loading on your website, the majority of users would say “yes” or even “absolutely”. But when malicious behavior ensues, everything should be double-checked and suspected, even assets that come from “trusted sources” like Google, Facebook, and Youtube.
In the past, we saw how adsense was abused with a malvertising campaign. Even more recently, we saw how attackers injected malware that called Google AdSense ads to generate revenue for the attackers, however, there’s an even more troublesome part of the toolkit that Google offers to webmasters – Google Tag Manager.
Continue reading Malicious Activities with Google Tag Manager at Sucuri Blog.