Prevalent ransomwareCrowti (also known as Cryptowall) and Tescrypt (also known as Teslacrypt) are two ransomware families that have infected over half a million PCs running Microsoft security software in the first half of 2015. Since the start of 2015, we've observed Crowti to be the most prevalent ransomware overall, accounting for 30% of all ransomware families, as shown in Figure 1.Notice in particular that Tescrypt sits within the six families that each had less than a 5% share of the total. This is because Tescrypt is relatively new – while we’ve seen big detection numbers between April and June, it still hasn’t been enough to wipe out Crowti and Krypterade.
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