US Patent 10110616 Using group analysis to determine suspicious accounts or activities

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for detecting suspicious users. One of the methods includes obtaining a collection of event logs or event feeds associated with a plurality of users to generate a collection of user properties; using the user properties to generate a plurality of groups of events; determining whether one or more groups are suspicious groups; and in response to a determination that one or more groups are suspicious, determining whether there are malicious accounts or events associated with each suspicious group.