Virus: app5.letitbefaster.world

It is a new variant of adware "Pirrit". Please read my blog: Remove MacKeeper virus from your Mac

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Use these methods -

How to delete Mac keeper malware manually .

Enter in System Library - Click on finder and take cursor on top menu bar , click on Go > computer > Macintosh HD

( a ) Applications - Mac keeper app

Click on library .

( b ) Launch Daemons

com.mackeeper.AdwareAnalyzer.AdwareAnalyzerPrivilegedHelper.plist

com.mackeeper.Mackeeper.MackeeperPrivilegedHelper.plist

( c ) PrivilegedHelperTools

com.mackeeper.Adware.AdwareAnalyzer.AdwareAnalyzerPrivilegedHelper

com.mackeeper.Mackeeper.MackeeperPrivilegedHelper

Enter in User Library - click on finder > Go > hold option key > Library , these are the locations where malware hide .

( a ) Application Support

Folder - com.mackeeper.AdwareAnalyzer

Folder - com.mackeeper.MacKeeper

Folder - com.mackeeper.Mackeeper.Mackeeper.Helper

Folder - Mackeeper - and its subfolder - statistic 2

Folder - Mackeeper 3 - and its subfolder - NE notifications

( b ) Launch Agents

Folder - com.mackeeper.AdwareAnalyzer.plist

Folder - com.mackeeper.Mackeeper.Helper.plist

( c ) Logs - Mackeeper.log

Mackeeper.log.signed

( d ) Preferences

com.mackeeper.AdwareAnalyzer.plist

com.mackeeper.Mackeeper.Helper.plist

com.mackeeper.Mackeeper.plist

( e ) Saved Application state

com.mackeeper.Mackeeper.savedstate

( f ) Caches

Folder - com.mackeeper.AdwareAnalyzer.plist

Folder - com.mackeeper.Mackeeper.Helper.plist

Folder - com.mackeeper.Mackeeper

These folders / subfolders and related .plist are dragged and dropped to the trash .

Also if the app is in download folder it is moved to the trash .

Restart the Mac from apple logo and empty the trash .

The name of mackeeper files could slightly differ , you can run https://etrecheck.com/

And post the results , also Malwarebytes anti malware for Mac is self sufficient and very much effective to remove mackeeper files immediately from Mac .

How do you know you have this thing?

For dealing with adware and the like:

Free Cyber Security & Anti-Malware Software | Malwarebytes

This is Adware. Use Malwarebytes, liked to above.

And, do yourself a favor and delete MacKeeper, it causes problems rather than cures them.