At Build 2018, Microsoft revealed a new JavaScript features that is supposed to add new functionality into Excel. However, it's also a gift for those who want to indulge in cryptomining schemes.

Microsoft is opening up Excel to developers with a new JavaScript API. It will let developers use custom data types like images, cards, and arrays.

In the well-established Office Ready-Fire-Aim tradition, Microsoft adds two new “features” that beg to be abused. Details appeared at Build, and the bad guys already have their keyboards primed.

It didn’t take long at all for a security researcher to demonstrate how easy it was to turn an Excel spreadsheet into a cryptomining machine.

The Online Tech Tips blog explains how to use a registry hack to add an "Open in New Excel Instance" item to your context menu—which will open your spreadsheet in a separate copy of Excel, so ...