The hackers behind a cyberattack that targeted Poland's grid infrastructure in December disabled communication devices for at least 30 sites across a number of energy facilities in different parts of the country. The attackers were able to render the communication devices --known as remote terminal units or RTUs -- not only inoperable but also unrecoverable. This new information, combined with my story last week that the attack used a wiper aimed at erasing IT systems, shows that the attack was a multi-pronged operation targeting both IT and OT systems. Nonetheless, researchers are calling this an opportunistic attack rather than a fully planned one https://www.zetter-zeroday.com/attack-against-polands-grid-disrupted-communication-devices-at-about-30-sites/