Obama’s secret struggle to punish Russia for Putin’s election assault -- The Washington Post

...Obama also approved a previously undisclosed covert measure that authorized planting cyber weapons in Russia’s infrastructure, the digital equivalent of bombs that could be detonated if the United States found itself in an escalating exchange with Moscow. The project, which Obama approved in a covert-action finding, was still in its planning stages when Obama left office. It would be up to President Trump to decide whether to use the capability...
https://www.washingtonpost.com/classic-apps/obamas-secret-struggle-to-punish-russia-for-putins-election-assault/2017/06/23/9d67e186-51da-11e7-be25-3a519335381c_story.html