Quickheal is an antivirus company that provides information about ransomware on various websites and social media platforms. Ransomware is a type of malicious software that encrypts a user's files and demands payment for the encryption key. Recent ransomware variants like Cryptowall have added new defenses to evade detection by antivirus software.

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http://www.pcworld.com/article/2867132/cryptowall-
ransomware-variant-has-new-defenses.html