(from NPR) The "Petya" cyberattack that has struck computers in at least 65 countries has affected businesses from airports in Ukraine to the shipping giant Maersk to U.S. hospitals. Like the WannaCry outbreak that struck computers in more than 150 countries in May, the Petya ransomware demands a $300 bitcoin payment to retrieve encrypted files and hard drives. Schools and other organizations are advised to install new security updates to prevent or limit the damage. If infected, users will see a fake black-and-white "CHKDSK" message on their screen; this is the last chance, security experts say, to power down their computers and protect their files before they're encrypted and held for ransom.
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