If your Android mobile is running slowly and loosing battery quickly, it might have been hacked - RS Post
If your Android phone is running slowly, loosing battery quick or is overheating more than usual, it is probably hacked. Lately many hackers have been mining cryptocurrency on smartphones and Android was a better target than Apple’s iphones.
In the best case if your phone was hacked and it is mining crypto, it will overheat, slow down and you will have to charge your battery a lot. But worse things could happen. Your phone could end up permanently damaged.