1. A tangible computer-readable memory medium storing program instructions within a security program that are executable on an information handling system to: receive data from an external network coupled to the information handling system, wherein the received data includes a first set of data for a web page; analyze the first set of data to make a determination whether the first set of data indicates that it is from a first source coupled to the external network, but is actually from a second source coupled to the external network, wherein the determination is based, at least in part, on an age of the first set of data; upon the determination that the first set of data is actually from the second source, provide output from the information handling system indicative of the determination.