Russian attempts to launch cyber-attacks against US conservative groups have been thwarted, Microsoft says.
The software company said Russian hackers had tried to steal data from political organisations, including the International Republican Institute and the Hudson Institute think tanks.
But they had been thwarted when its security staff had won control of six net domains mimicking their websites.
Microsoft said the Fancy Bear hacking group had been behind the attacks.
“We’re concerned that these and other attempts pose security threats to a broadening array of groups connected with both American political parties in the run-up to the 2018 elections,” Microsoft said in its blog detailing its work.
The action comes soon after the US charged 12 Russian intelligence officers with hacking computer networks used by Hillary Clinton and the Democratic Party.
Russia has consistently denied meddling in the elections or mounting any cyber-attacks on US institutions.