More than 1,600 victims have surfaced and more than 5 billion files have been encrypted by CryptoWall. Dell puts the number of infections between mid-March and Aug. 24 at nearly 625,000. Dell said it saw payments from 1,683 victims totaling $1,101,900 most paying either $500 or $500. The ransom payments are in stark contrast to the recommendations of some experts who advise victims to avoid remitting payments because decryption keys or instructions on how to unlock computers are not provided by the criminals.
Source: https://threatpost.com/cryptowalls-haul-1m-in-six-months/107978/