10. Your number of friends has grown.
If you notice that you suddenly have many more friends on your social networks who you don’t know and don’t remember adding, it means that your account has been hacked and is being used to send spam.
9. New icons appear on your dashboard.
When you launch your browser and notice new icons on your dashboard, this might be a sign of the infiltration of some dangerous code into your computer.
8. The cursor moves on its own.
If you notice that your cursor is moving on its own and is highlighting something, your computer was definitely hacked.