On Tuesday Roman Klimenko headed into his Kiev accounting office for work just like he does every day. A few hours after he opened his tax preparation software, however, something went horribly wrong. “The screen became red,” said Klimenko. “A warning appeared, and everything on the hard drive was scrambled.” In a matter of moments he lost all of his filings from last year.

This same situation played out across tens of thousands of Ukrainian computers in that same instant. Continue reading →