Battery Low [Q] Rooting Android

Dear XDA developer,

I am new to rooting. And before rooting I searched almost all the websites for pros and cons of rooting. I recently rooted my LG G2 for connecting PS3 controller via sixaxis. But i noticed that the data consumption increased way too much before rooting. I frequently close any running apps from task manager, but still the battery is draining very quickly and increased data consumption. My friend told that while rooting the phone, may be some malware entered when installing super user. Please suggest what should I do to avoid this. Please help.