Local reputation to adjust sensitivity of behavioral detection system

Abstract

Source assets are monitored for activities, each activity associated with a corresponding activity weight indicating probability of the activity resulting from a security compromise. A source asset is determined to perform a particular activity indicative of a potential security compromise, such as a download of an executable of malicious reputation. A source asset tracking instance is instantiated to include data identifying the particular activity. The tracking instance is to be updated based on identification of subsequently monitored activities. A reputation value is determined for the activity weight of the particular activity based at least in part on the malicious reputation of the executable. An asset reputation is determined for the source asset from the corresponding activity weights of monitored activities involving the source asset and a security risk is determined when the asset reputation exceeds a threshold.