In this May 13, 2017, file photo, a screenshot of the warning screen from a purported ransomware attack, as captured by a computer user in Taiwan, is seen on a laptop in Beijing. Over the weekend, Chester County school servers were hit by ransomware but no data was stolen or breached.
In this May 13, 2017, file photo, a screenshot of the warning screen from a purported ransomware attack, as captured by a computer user in Taiwan, is seen on a laptop in Beijing. Over the weekend, Chester County school servers were hit by ransomware but no data was stolen or breached. Mark Schiefelbein AP
In this May 13, 2017, file photo, a screenshot of the warning screen from a purported ransomware attack, as captured by a computer user in Taiwan, is seen on a laptop in Beijing. Over the weekend, Chester County school servers were hit by ransomware but no data was stolen or breached. Mark Schiefelbein AP