Bitcoin's booming value has driven a huge rise in crypto-currency themed malware, say security firms.
In one month, anti-malware software company Malwarebytes said it stopped almost 250 million attempts to place coin-mining malware on to PCs.
Symantec said it had seen a "tenfold" increase in the amount of malicious code connected with crypto-cash.
Cyber-thieves are using both dedicated software, hacked websites and emails to snare victims.
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