Exclusive: A cyberattack targeting Poland's energy infrastructure in December used wiper malware that would have erased grid computers and rendered them inoperable had it not been thwarted, a researcher at @ESET told me. The researcher calls the attack "unprecedented" for Poland and "substantial."
https://www.zetter-zeroday.com/cyberattack-targeting-polands-energy-grid-used-a-wiper/

A cyberattack that targeted power plants and other energy producers in Poland at the end of December used malware known as a “wiper” that was intended to erase computers and cause a power outage and other disruption to services, says European security firm ESET, which obtained a copy of the
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