As per the security concern just don't download apps of Kiniwini or any north Korean apps.
And above all if you have rooted your device then make unroot it again. Further if you are not sure of any sites then just don't surf those sites and dont download any apps from those sites. Also as the new attack has been triggered using ads (what!) thus to keep your device secure use browser having ad blocker. These simple ways is enough to keep your device secure.

flyme browser has been designed to show ads as content, but don't know how much security has been implemented during making this driver. Better keep distance from it at least now for not getting affected with malware.