There latest threat talked about here
https://motherboard.vice.com/en_us/article/yw79k5/hacker-group-threatens-dump-911-insurance-files-dark-overlord?utm_source=reddit.com
The group seems to be legit.
https://www.ncsc.gov.uk/report/weekly-threat-report-3rd-november-2017
A cyber crime group called ‘The Dark Overlord’ has claimed responsibility for conducting cyber-enabled extortion campaigns in recent weeks. Victims include a London-based plastic surgery clinic and a Hollywood production studio, both of which are believed to have a number of high-profile clients. The group has a history of hacking organisations to obtain sensitive information before demanding money in exchange for not leaking it into the public domain. They leak snippets of data to the media to encourage them to report on their activity. This is aimed at “proving” that a breach has taken place, and increases the pressure on the victim to pay the ransom. ‘The Dark Overlord’ has been responsible for indiscriminately targeting health institutions, schools and media production companies over the last year.
They claim is its bigger than the Edward Snowden hack.
https://twitter.com/tdo_h4ck3rs