Cyberwar — Qatar

Qatar

May 2017 The Washington Post reported the U.S. government officials had said that that UAE government had discussed plans to hack Qatar, and then had done so.
Washington Post 2017-07-16

June 2017 The New York Times reported on events from the preceding month. News reports appeared on the official Qatari new agency's web site, designed to alienate the U.S. and Gulf Arab nations. A few days later, emails from the U.A.E.'s ambassador to the U.S. began to appear in Western news media and the Qatari news network Al Jazeera. Saudi Arabia and the U.A.E. led smaller Arab nations in cutting off diplomatic relations, travel, and trade with Qatar.
New York Times 2017-06-08

The U.S. F.B.I. and U.K law enforcement agreed that the official Qatari news agency was hacked. Qatari officials blamed the Saudis and Emiratis. The F.B.I. and some industry analysts said that it was probably done by Russian hackers for hire. Also see the Bellingcat report Bahamut, Pursuing a Cyber Espionage Actor in the Middle East.
Washington Post 2017-07-16 Bellingcat

October 2017 SCL Social Limited, part of SCL Group/Cambridge Analytica, was hired by the UK company Project Associates for approximately $330,000 to implement a social media campaign for the UAE against Qatar.
Foreign Agents Registration Act filing

The United Arab Emirates and Qatar leaked emails, issued propaganda, and otherwise used information to influence U.S. policy on Iran and the UAE and Saudi blockade of Qatar.
"How Two Persian Gulf Nations Turned The US Media Into Their Battleground"