The notification icon on android 5 is in grey scale for norton, but malwarebyte has a colored icon, so the developer of Norton app must check again, I had a earlier case, see below.
Re: 3.12.0.3014 changes icon in upper left to white circle with lock
Posted: 22-Oct-2015 | 3:54PM • Edited: 22-Oct-2015 | 3:54PM • Permalink
I got confirmation that the white circle you are seeing is the new look if you are on Android 5 or later. It is something to do with a standardized way of showing notification icons recommended by Google.
The 4.4 and below versions still shows the old style.
This is not correct because malwarebytes icon is in color.