https://arstechnica.com/information-technology/2020/06/machine-learning-clusters-in-azure-hijacked-to-mine-cryptocurrency/

Attackers recently hijacked powerful machine-learning clusters inside Microsoft’s Azure cloud-computing service so that they could mine cryptocurrency at the expense of the customers who rented them, the company said Wednesday.

The nodes, which were misconfigured by customers, made the perfect target for so-called cryptojacking schemes. Machine-learning tasks typically require vast amounts of computing resources. By redirecting them to perform the compute-intensive workloads required to mine digital coins, the attackers found a means to generate large amounts of currency at little or no cost.