This whitepaper is a study that gives an overview about what methodology a hacker uses to hack into a system, discusses a theft of millions from the central bank of Bangladesh, and more.
You can download it from the following link: https://packetstormsecurity.com/files/download/156575/Deciphering-SWIFT-DRIDEX.pdf
Source: https://packetstormsecurity.com/files/156575/Deciphering-The-SWIFT-DRIDEX-Relationship-In-Bank.html