A blast from the past surfaced recently among those who play Microsoft Excel-based Sudoku puzzles: malware spread by macros. Spreading malicious code via macros was the rage among the digital underground in the late 1990s, so much so that Microsoft eventually disabled them by default. But according to Sophos, someone s found a way to get people to turn the macros back on to inject malware onto their machines. The stolen information is encoded and sent to an aol.com e-mail address.
Source: https://threatpost.com/malware-infested-sudoku-puzzles-researchers-121912/77336/