When a piece of unprecedented malicious software rampages through thousands of critical networks around the world, it tends to get our full attention. And this week's digital plague, known as Petya (or NotPetya or Nyetya) proved especially vicious. It paralyzed thousands of computers, including those of Ukrainian government agencies, transportation infrastructure, and companies, as well as international targets including Danish shipping firm Maersk and US pharmaceutical giant Merck.

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