Ransomware is evil, and it continues to prey upon thousands of businesses every year. Most infections are fairly quiet affairs: A small business gets infected, almost always by some employee opening an email attachment he or she mistakes as legitimate but that really contains the payload of a virus. Then several undetected hours later, all of the business’ files—at least those the employee had access to, which in a lot of businesses without good security and permissions policies is all of the files—are encrypted, and demands for payment of a ransom in Bitcoin are made in exchange for the decryption key.
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(Insider Story)
Source: Security
