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Chen, Yizheng, Nadji, Yacin, Kountouras, Athanasios, Monrose, Fabian, Perdisci, Roberto, Antonakakis, Manos, Vasiloglou, Nikolaos.  2017.  Practical Attacks Against Graph-based Clustering. Proceedings of the 2017 ACM SIGSAC Conference on Computer and Communications Security. :1125–1142.
Graph modeling allows numerous security problems to be tackled in a general way, however, little work has been done to understand their ability to withstand adversarial attacks. We design and evaluate two novel graph attacks against a state-of-the-art network-level, graph-based detection system. Our work highlights areas in adversarial machine learning that have not yet been addressed, specifically: graph-based clustering techniques, and a global feature space where realistic attackers without perfect knowledge must be accounted for (by the defenders) in order to be practical. Even though less informed attackers can evade graph clustering with low cost, we show that some practical defenses are possible.
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Kintis, Panagiotis, Miramirkhani, Najmeh, Lever, Charles, Chen, Yizheng, Romero-Gómez, Rosa, Pitropakis, Nikolaos, Nikiforakis, Nick, Antonakakis, Manos.  2017.  Hiding in Plain Sight: A Longitudinal Study of Combosquatting Abuse. Proceedings of the 2017 ACM SIGSAC Conference on Computer and Communications Security. :569–586.
Domain squatting is a common adversarial practice where attackers register domain names that are purposefully similar to popular domains. In this work, we study a specific type of domain squatting called "combosquatting," in which attackers register domains that combine a popular trademark with one or more phrases (e.g., betterfacebook[.]com, youtube-live[.]com). We perform the first large-scale, empirical study of combosquatting by analyzing more than 468 billion DNS records - collected from passive and active DNS data sources over almost six years. We find that almost 60% of abusive combosquatting domains live for more than 1,000 days, and even worse, we observe increased activity associated with combosquatting year over year. Moreover, we show that combosquatting is used to perform a spectrum of different types of abuse including phishing, social engineering, affiliate abuse, trademark abuse, and even advanced persistent threats. Our results suggest that combosquatting is a real problem that requires increased scrutiny by the security community.