A system, method, and apparatus for detecting remote control of a client device are disclosed. An example network security apparatus includes a network switch configured to route first data packets between a client device and a content provider device, determine IP addresses of other devices that transmit second data packets to or receive second data packets from the client device, and throttle the second data packets destined for the client device. The apparatus also includes a controller configured to receive signal packets indicative of activity in relation to a webpage provided by the content provider device to the client device and instruct the network switch to throttle the second data packets after receiving one of the signal packets. The controller is also configured to provide an indication of a malicious device remotely controlling the client device responsive to not receiving another signal packet within a specified time period.