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Besides coming with unprecedented benefits, the Internet of Things (IoT) suffers deficits in security measures, leading to attacks increasing every year. In particular, network environments such as smart homes lack managed security capabilities to detect IoT-related attacks; IoT devices hosted therein are thus more easily targeted by threats. As such, context awareness of IoT infections is hard to achieve, preventing prompt response. In this work, we propose MUDscope, an approach to monitor malicious network activities affecting IoT systems in real-world consumer environments. We leverage the recent Manufacturer Usage Description (MUD) specification, which defines networking allow-lists for IoT devices in MUD profiles, to reflect consistent and necessarily-anomalous activities from smart things. Our approach characterizes this traffic and extracts signatures for given attacks. By analyzing attack signatures for …