To make the matter worse, I am sure you were victim of clipboard virus.
Jesus, this is so devastating, all my savings lost due to a virus.
Yes its a very interesting Type of virus which only changes the address to the child-parent address of the coder who created that virus.
The first create of the virus was Infinity Technology on Dark net.
Generally people who want to download bitcoin hack tools(which really doesnot exist) become the victim of this.