There is disclosed in an example a computing apparatus, including: a process deprivilging engine operable for: recognizing that a process has an undetermined reputation; intercepting a first access request directed to a first resource; determining that the first resource is not owned by the process; and at least partially blocking access to the first resource. There is further disclosed a method of providing the process deprivileging engine, and one or more computer-readable mediums having stored thereon executable instructions for providing the process deprivileging engine.