eFast Malware Hijacks Browser With Chrome Clone (malwarebytes.org)
An anonymous reader writes with a report at The Stack that: eFast Browser, a new malicious adware which disguises itself as Google Chrome, has hijacked internet users' systems in an apparent effort to serve its own ads and harvest user activity to sell to third-party advertisers. It is able to mirror the aesthetics of Chrome as it uses the same source code, available across the open-source project Chromium. Once installed, eFast places ads across existing web pages, linking to third-party e-commerce sites or other malicious platforms.
The program appears to be available only for Windows.
Last time I installed Chrome (not Chromium, but actual Chrome) on Ubuntu I still had to download it from Google trusting Google's process rather than Canonical's. So no, it didn't go through some encryption protected carefully managed central repo. And, obviously, if someone can install software from Google via downloads, they can install other software via downloads, including malware.
You are not alone. This is not normal. None of this is normal.