FRAUD DETECTION NETWORK SYSTEM AND FRAUD DETECTION METHOD

摘要

[Problem] To provide an illicit activity sensing network system and illicit activity sensing method which efficiently detect behavior of malware which carries out illicit activity, are easily adopted, and are not susceptible to attack. [Solution] Provided is an illicit activity sensing network system, in which a web server device includes a call script in web content information and transmits same to a user terminal device, and the web content is displayed and the call script executed upon the user terminal device. The user terminal device acquires an illicit activity sensing script from an illicit activity sensing server on the basis of the call script, searches on the basis of the illicit activity sensing script for search subject data which is included in the web content information, and transmits the result of the search to the illicit activity sensing server device. A prescribed illicit activity countermeasure action is carried out on the basis of an illicit activity sensing result which is received from the illicit activity sensing server device.