  The increased penetration of Electric Vehicles (EVs) in the transportation
sector has increased the requirement of Fast Charging Direct Current (FCDC)
stations to meet customer's speedy charging requirements. However, both
charging stations and EVs connection to the communication infrastructure as
well as the power grid makes it vulnerable to cyber attacks. In this paper, the
vulnerability of the EV charging process is initially studied. We then show how
a botnet of compromised EVs and FCDC stations can be utilized to launch cyber
attacks on the power grid resulting in an increase in the load at a specific
time. The effect of such attacks on the distribution network in terms of line
congestion and voltage limit violations is investigated. Moreover, the effect
of the botnet of the transmission network is also studied.
