  Serverless computing is the latest paradigm in cloud computing, offering a
framework for the development of event driven, pay-as-you-go functions in a
highly scalable environment. While these traits offer a powerful new
development paradigm, they have also given rise to a new form of cyber-attack
known as Denial of Wallet (forced financial exhaustion). In this work, we
define and identify the threat of Denial of Wallet and its potential attack
patterns. Also, we demonstrate how this new form of attack can potentially
circumvent existing mitigation systems developed for a similar style of attack,
Denial of Service. Our goal is twofold. Firstly, we will provide a concise and
informative overview of this emerging attack paradigm. Secondly, we propose
this paper as a starting point to enable researchers and service providers to
create effective mitigation strategies. We include some simulated experiments
to highlight the potential financial damage that such attacks can cause and the
creation of an isolated test bed for continued safe research on these attacks.
