A former intern at security firm FireEye has admitted in federal court that he designed a malicious software tool that allowed attackers to take control of other Android phones so they could spy on their owners. Morgan Culbertson, 20, pleaded guilty to federal charges involving Dendroid, a software tool that provided everything needed to develop highly stealthy apps that among other things took pictures using the phone's camera, recorded audio and video, downloaded photos, and recorded calls.