http://www.zdnet.com/article/hackers-are-now-using-the-exploit-behind-wannacry-to-snoop-on-hotel-wi-fi/ towards the end
https://www.wired.com/2014/11/darkhotel-malware/
https://www.securityweek.com/north-korean-hackers-exploit-recently-patched-zero-day
https://www.wired.com/story/north-korea-hacking-zero-days-google/ - South Korea attribution
https://www.securityweek.com/firefox-ie-vulnerabilities-exploited-attacks-china-japan
https://www.cyberscoop.com/dark-hotel-qihoo-360-covid-19/
https://securelist.com/apt-trends-report-q1-2020/96826/
https://www.welivesecurity.com/2020/05/13/ramsay-cyberespionage-toolkit-airgapped-networks/v
https://www.welivesecurity.com/2020/05/13/ramsay-cyberespionage-toolkit-airgapped-networks/
https://blog.bushidotoken.net/2020/06/deep-dive-darkhotel-apt.html
https://www.securityweek.com/purple-fox-exploit-kit-targets-vulnerabilities-linked-darkhotel-group
https://www.securityweek.com/windows-and-ie-zero-day-vulnerabilities-chained-powerfall-attacks
https://securelist.com/ie-and-windows-zero-day-operation-powerfall/97976/
https://www.crysys.hu/publications/files/tedi/ukatemicrysys_territorialdispute.pdf
https://www.securityweek.com/17-malware-frameworks-target-air-gapped-systems-espionage
https://threatpost.com/darkhotel-apt-wynn-macao-hotels/178989/
https://www.securityweek.com/hotels-macau-targeted-attacks-linked-south-koreas-darkhotel-apt