Criminals hijack browsers to mine cryptocurrency
Cyber criminals supplementing their income by mining cryptocurrencies like Bitcoin is nothing new. Usually this has been done by installing malware or PUPs on the machines of unsuspecting users.
The campaign is targeted at the Feathercoin, Litecoin and Monero currencies. These need less CPU power to mine than others, so there's less impact on the performance of the victim’s system.
You can find more details of the attack on the ESET WeLiveSecurity blog.