As the popularity of virtual currencies has grown, hackers are focusing on a new type of heist: putting malicious software on peoples' handsets, TVs and smart fridges that makes them mine for digital money

"We saw organisations whose monthly electricity bill was increased by hundreds of thousands of dollars," said Maya Horowitz, Threat Intelligence Group Manager for Checkpoint, a cybersecurity company.
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Crypto-jacking is not done only by installing malicious software. It can also be done through a web browser. The victim visits a site, which latches onto the victim's computer processing power to mine digital currencies as long as they are on the site. When the victim switches, the mining ends.