Noisy tokens can be placed in locations of client end stations such that local operations performed upon the noisy tokens generate network traffic. A traffic monitoring module (TMM) can determine normal activity patterns of network traffic resulting from one or more of the placed noisy tokens being activated by one or more non-malicious operations, and identify that other network traffic resulting from one or more of the noisy tokens being activated does not meet the one or more normal activity patterns. In response, the TMM can cause an alert to be generated.