Customers of a computing resource service provider may operate one or more computing resource provided by the computing resource service provider. In addition, the customers may execute agent using the one or more computing resources provided by the computing resource service provider. Operational information from customer-operated computing resources may be obtained by the agents and evaluated for security threats. The operational information may be evaluated based at least in part on a set of security rules. The security rules may be generated at least in part on customer input to generate customer defined security rules.