Methods and systems for detecting one or more anomalous devices are disclosed. For each of a plurality of devices, semi-structured data may be received from the device. For each pair of devices, of the plurality of devices, a similarity measurement may be determined between semi-structured data from a first device of the pair of devices and semi-structured data from a second device of the pair of devices. One or more anomalous devices may then be identified and one or more remedial actions may be performed for the one or more identified anomalous devices.