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CryptoWall is ransomware that infects systems via infected websites and/or ads on websites or infected attachments to an email!
Know what you’re doing on your computer, please don’t click indiscriminately!!
The primary form of delivery is an email. The user receives an email with a link or an attachment. The link is usually a Dropbox link. The file is usually a zip, exe, vbs, pdf, or txt file.
These files pretend to be invoices, purchase orders, bills, complaints, or other business communications.
When you double-click on the fake file, it will instead infect your computer with the CryptoWall infection and will start to scan your computer’s drives for data files that it will encrypt. When the infection is scanning your computer it will scan all drive letters on your computer including removable drives, network shares, or even DropBox mappings. In summary, if there is a drive letter on your computer it will be scanned for data files by CryptoWall.
http://www.scmagazine.com/cryptowall-surpasses-cryptolocker-in-infection-rates/article/368920/2/