Hackers who stole US $81 million from Bangladesh’s central bank likely used custom malware, researchers say. The malware is designed to interfere with SWIFT transaction software used by many financial institutions. SWIFT is a cooperative society owned by thousands of financial institutions that runs the world’s largest secure financial messaging network. One of the malware components bypasses a validation check in a library that’s part of SWIFT’s Alliance software suite. The program can manipulate confirmation messages, which are automatically printed out on paper by the bank’s systems.”]