The Great Billion $$$ Bank Hack/Robbery
Below are two links providing information on the billion dollar hack affection over 100 banks worldwide. The Security Week Link provides an overview of the robbery and how it was done. The Kaspersky detailed report provides specific details describing how the attackers carried out the attack and some of the indicators showing what to look for.
Security Week article describing the 100+ bank hack and robbery:
Kaspersky report providing details about billion $$$ robbery: