It reminds me of how I rooted my Wiko Android phone: with KingRoot.
It's a bloody effective rooting app (nothing else could root my Wiko--a French-Chinese brand), with the nicest interface, no ads, that also proposes to "optimize" your phone through various ways. Best thing on earth!
I've been using it for one year; until my brothers told me this app was Chinese, and had a strange behaviour: it creates 2 levels of super users, kingsu (used by the app, super-administrator) and su (used by any rooted app, with a little less privileges than kingsu). After a little investigation, I figured that the app was sending tens of Mb of data per month, god knows where. Obviously, I couldn't restrict its network access, because xPrivacy (a privacy app) didn't have enough rights to restrain kingsu user. And kingsu had every possible priviliege, hence it could get any available information from my phone...
Some little geeks have built hacks to allow deletion of this app in favour of "good" rooting apps like supersu. But it wasn't so easy to achieve.
So, yes indeed, better beware before installing privileged Chinese applications!