The worst thing that can happen to your business is a ransomware attack.

This kind of attack is where hackers take control of your network and encrypt all your data (making it not usable). They then won’t undo the damage unless you pay the ransom fee, which is always a ridiculous sum.

The reason they can do so much damage is they were able to break into your system a long time before they launch the attack. There are some symptoms you can keep an eye out for indications you’ve been breached.

Here are three ways you can see if hackers have already infiltrated your system.