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A spate of ransomware attacks in recent months has compromised critical infrastructure and disrupted daily life across the United States and globally

The anatomy of a ransomware attack

A threatening voicemail, research into company executives and finances, even step-by-step guides to using cryptocurrency. These are some of the evolving tactics of ransomware groups that have turned this cybercrime into a highly lucrative underground business. As CNN’s Clare Sebastian reports, businesses and law enforcement are racing to get ahead of them.

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