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Petya (malware family)
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Petya is a family of encrypting malware that was first discovered in 2016. The malware targets Microsoft Windows–based systems, infecting the master boot record to execute a payload that encrypts a HDD or SSD file system table and performs a fake CHKDSK after a restart. This prevents Windows from booting, as the master boot record is overwritten; subsequently, Petya demands that users make a Bitcoin payment to regain access.