In China, a group of pirates would have collaborated with computer maintenance companies to use cyber-café computers to undermine crypto-currencies.
The police reportedly arrested 16 individuals suspected of participating in a crypto-currencies mining operation. These would have managed to get the equivalent of 5 million yuan (650 000 euros) by diverting last year more than 100 000 computers placed in internet cafes of 30 Chinese cities.
http://hznews.hangzhou.com.cn/shehui/content/2018-06/16/content_7020998.htmThey would have developed a malware allowing them to undermine the crypto-monnaie Siacoin (SIA) on infected devices. They would then have asked several computer maintenance companies to take advantage of routine checks to inject this software into cafes computers.