Hackers are indeed able to gain access to your screen, webcam, microphone and more through something called a remote administration tool (RAT). Creepy! These do have legitimate uses, like when an IT professional gains access to your computer to fix it. But hackers (or ratters) also use this tool to steal information from your computer, play pranks on you, or use your webcam to grab videos and photos of whoever is in front of the computer. Tap on the image and read more.