I read about this one on the Sophos Blog this morning. Sophos's Vanja Svajcer had heard a rumor that some ATMs in Russia had been hacked with Trojan software installed on them. So he checked submissions from VirusTotal and found that there were indeed 3 samples of Trojan code for Windows making Diebold-specific calls. The oldest one was from November.
I called up Diebold, who told me that in January, they started warning customers that criminals in Russia were breaking into Diebold ATMs and installing card-sniffing software and "devices." Suspects have been apprehended in the case, Diebold said.
I don't have a lot more details, but here are two letters Diebold sent out to customers. They're pretty interesting.