Data from the “IBM X-Force Threat Intelligence Index” for 2018 illustrated that threat actors have been increasingly using malicious cryptomining, aka cryptojacking attacks, to easily monetize their access to systems with minimal risk. The 2019 report showed that threat actors continue to use these attacks to compromise systems and generate a revenue stream.

https://securityintelligence.com/cryptojacking-attacks-whos-mining-on-your-coin/