Enlarge / APT37, a group believed to be backed by the North Korean government, has found success exploiting the bits of Internet Explorer still present in various Windows-based apps. (credit: Aurich Lawson | Getty Images) Microsoft's Edge browser has replaced Internet Explorer in almost every regard, but some exceptions remain. One of those, deep inside Microsoft Word, was exploited by a North-Korean-backed group this fall, Google security researchers claim. It's not the first time the government-backed APT37 has utilized Internet Explorer's lingering presence, as Google's Threat Analysis Group (TAG) notes in a blog post.