The only reference I could find to Keeper is a password storage system for the iPhone and Watch. There is a Keeper Vault system for Windows to store passwords. Are you using any of these products?
Is it possible you have (or had) an app installed called "MacKeeper"...or another app installed/previously installed called "Keeper"? If so...this could be it.
I checked in the App Store and I have definitely downloaded Keeper Password Manager in the past but not Mac Keeper so I'm pretty sure I have found the culprit.
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