Cryptojacking: The hackers mining digital currencies from your computer

As demand for bitcoin reaches record heights, many people would jump at the chance to earn a little digital gold in their spare time and line their wallets with cryptocurrency.

But most amateur bitcoin enthusiasts don’t expect their own PCs to be hijacked to harvest coins for cyber criminals.

In recent months, a new form of malware has emerged through malicious websites that harvest digital tokens using a the processing power on the victim’s computer. It has affected potentially millions of users, with proceeds from the operation totalling millions of pounds a year.

A sudden trend in so-called “cryptojacking” has taken off in recent months, which sees hackers attack websites to gather free digital coins. Sites affected have including CBS Showtime, UFC live-streams and even official websites for the governments of Moldova and Bangladesh.