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In this paper we provide evidence of an emerging criminal infrastructureenabling impersonation attacks at scale. Impersonation-as-a-Service (ImpaaS)allows attackers to systematically collect and enforce user profiles(consisting of user credentials, cookies, device and behavioural fingerprints,and other metadata) to circumvent risk-based authentication system andeffectively bypass multi-factor authentication mechanisms. We present theImpaaS model and evaluate its implementation by analysing the operation of alarge, invite-only, Russian ImpaaS platform providing user profiles for morethan $260'000$ Internet users worldwide. Our findings suggest that the ImpaaSmodel is growing, and provides the mechanisms needed to systematically evadeauthentication controls across multiple platforms, while providing attackerswith a reliable, up-to-date, and semi-automated environment enabling targetselection and user impersonation against Internet users as scale.

Impersonation-as-a-Service: Characterizing the Emerging Criminal Infrastructure for User Impersonation at Scale