A method, system, computer program product, and/or computer readable medium of instructions for identifying a malicious entity in a processing system, comprising determining an entity threat value for an entity, the entity threat value being indicative of a level of threat that the entity represents to the processing system, wherein the entity threat value is determined based on one or more characteristics of the entity; and compare the entity threat value to an entity threat threshold to identify if the entity is malicious. In another form, there is provided a method, system, computer program product, and/or computer readable medium of instructions for identifying a malicious entity in a processing system, comprising determining one or more input values indicative of an entity; and performing a fuzzy logic analysis in relation to the one or more input values to identify if the entity is malicious.