The First Bank of Macau is a bank where Alexei Volkoff has an account.
The security was run by mercenaries, making it impossible to break into. The CIA itself was only able to do so when Vivian Volkoff, an account holder, decided to aid them in exchange for the right to visit her father in prison.
In "Chuck Versus the First Bank of Evil", Chuck flashes on military grade servers, and Beckman informs them that the bank was using the servers to turn itself into a black-market stock-exchange. With the help of Vivian, the CIA is able to hack into the server to obtain it's intel and thwart the bank's plans, as well as get valuable information on the many criminal organizations with which the bank was linked.