My phone attacked by Addware

Hello Everyone,
Everytime I turned on mobile data or wifi, my phone started installing apps in background and advertisement prompt up on the main screen. App like adultVictoria, twitter (5kb), HD etc. installed as system app and I have to forced stop and disabled them because those apps are become system apps and I cannot uninstall it from my phone.
I was totally helpless and then I installed Kingo One click root.apk and uninstalled them successfully. But problem still persist. Suddenly my screen back to home screen and there are many box message of apps that says stopped working and I have to tap ok ok ok almost whole day.
I finally decided to wipe all data and partition and install custom ROM i.e. CM13 and accordingly I downloaded it. I tried to flash custom recovery in my rooted phone but unfortunately couldn't able to do it. Under default recovery system it says "failed to verify signature" etc. etc.
My phone is Samsung Galaxy Grand Duos i9082
Can anyone help me here?
Flashfy, ROM manager all apk failed to serve the purpose.

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