https://arstechnica.com/information-technology/2018/02/the-harmful-drive-by-currency-mining-scourge-shows-no-signs-of-abating/

The scourge of drive-by currency mining—in which websites and apps covertly run resource-draining code on other people's devices—shows no sign of abating. Over the weekend, researchers added two more incidents: one involves more than 4,200 sites (some operated by government agencies), while the other targets millions of Android devices.

The first incident affected sites that offer a free text-to-speech translation service called Browsealoud. On Sunday, someone changed the JavaScript code hosted here to include currency-mining code from Coinhive, a controversial site that uses the devices of site visitors, usually without their permission, to generate digital coin known as Monero.