A file-encrypting ransomware program called CryptoWall infected over 600,000 computer systems in the past six months and held 5 billion files hostage, earning its creators more than $1 million, researchers found.

The Counter Threat Unit (CTU) at Dell SecureWorks performed an extensive analysis of CryptoWall that involved gathering data from its command-and-control (C&C) servers, tracking its variants and distribution methods and counting payments made by victims so far.

CryptoWall is “the largest and most destructive ransomware threat on the Internet” at the moment and will likely continue to grow, the CTU researchers said Wednesday in a blog post that details their findings.

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