1. A computer-implemented method for securing content in a network cache, comprising: monitoring a computing device associated with the network cache to detect a network activity performed by the computing device, the network activity comprising establishment of a network connection with a computer network; responsive to the detection of the network activity performed by the computing device, examining content in the network cache to identify a piece of suspicious content in the network cache, the examining comprising: determining that a website from which a piece of cache content originated is a sensitive website subject to security control; responsive to the determination that the website is a sensitive website subject to security control, retrieving a response from the sensitive website through an out-of-band communication using the established network connection; comparing the piece of cache content with the response; and responsive to the piece of cache content not matching the response, identifying the piece of cache content as the piece of suspicious content in the network cache; and responsive to the identification of the piece of suspicious content in the network cache, preventing the piece of suspicious content in the network cache from carrying out malicious activities in the computing device.