Manually Generated Anomaly

Hi, 

We got an alert today with the following risk name: "Manually Generated Anomaly". I am trying to figure out what this is. The File Path is 

c:\users\username\appdata\local\assembly\dl3\"random number and letters"\"random number and letters"\"random number and letters"\"random number and letters"\"random numbers".token

The action taken on the Risk is "Cleaned"

Can someone help me understanf what the Risk name mean?

Our version of SEP is 12.1

Thank you