Correlating threat information across sources of distributed computing systems

Customers of a computing resource service provider may operate one or more computing resources provided by the computing resource service provider. In addition, the customers may implement security applications and/or devices using the one or more computing resources provided by the computing resource service provider. Operational information from customer operated computing resources may be correlated with operational information from computing resources operated by the computing resource service provider or other entities and correlated threat information may be generated. Anomalous activity may be detected based at least in part on the correlated threat information.