You need to enter an exception in your Mac antimalware program for the BitCore-QT.app.
Depending on how agressive your settings are, such miner warning is legit as >99% of ordinary users do not use crypto wallets on their PC/Mac.
... guys just opened my Mac wallet and instantly notice my bitcore OSX app was about 106 mb , when I opened bitcore my
AV showed this up and blocked a miner in the wallet ?
/Applications/BitCore-Qt.app/Contents/MacOS/BitCore-Qt,Quarantined,OSX_Miner.PFL,Real Time,1
!!
and also now on first try the app doesn't open ...
although reinstalling the wallet helped ...