Midnight Mimosa malware comes preinstalled on some Android phones and is difficult for users to remove without root access.

A malware campaign dubbed 'Midnight Mimosa' has been discovered on low-cost Android smartphones that ship with malicious software embedded in their firmware, allowing attackers to silently install ...

I'll admit it, I once never cared about the whole open-source versus closed-source debate. If an app worked well, looked good ...