Identifying and Assessing Malicious Resources

Methods, systems, and computer-readable media for analyzing and indicating network resources as potentially malicious are disclosed. Some aspects of the disclosure provide ways for threat-analyzing individuals and/or organizations to transmit information about potentially malicious resources in a safe manner. Users or computing devices may transmit non-resolvable "de-fanged" resource identifiers, which lessens the likelihood that the receiving computing device will download malicious data or applications from the resource. Some aspects disclosed herein provide ways to correctly and accurately "re-fang" the resource identifier for threat analysis of the resource, for example by selecting one or more re-fangers to apply and applying the re-fangers to the identifier. Data may be retrieved from the resource (for example via a headless or non-interactive browser), and the resource and/or resource identifier may be categorized as malicious. Indications of a resource as malicious may be transmitted to other computing devices to reduce or eliminate malicious activity.