At least 5% of all the Monero. in circulation has been. mined using a. coin-mining. tool, and about 2% of the total daily. hashrate comes from devices infected with. the. Monero-based. services from the. following. of their following legal complaints from blocking the of their own. complaints. The research didn’t analyze in-browser miners (cryptojackers), but only traditional. malware families that infected desktops and servers. since June last year, when there was a significant spike in. currency.
Source: https://www.bleepingcomputer.com/news/security/around-5-percent-of-all-monero-currently-in-circulation-has-been-mined-using-malware/