https://techcrunch.com/2018/08/23/russian-hackers-slipped-up-in-attempt-to-hack-senator/

Hackers that targeted a Democratic senator up for reelection this year may have left behind clues in their attack that further suggest Russian involvement.

The office of Claire McCaskill, a Missouri senator, was targeted in an apparent targeted phishing attack from a fake Microsoft domain that the software giant later seized pursuant to a court order. The Daily Beast reported that a then-McCaskill staffer was the target of the attack, which was attributed to hackers linked to Russian intelligence — largely because the effort was similar to the phishing attack on Hillary Clinton’s campaign chair John Podesta, whose account was successfully breached and emails were shared with WikiLeaks.