Security-conscious travelers typically avoid public WiFi hotspots, instead using VPNs and other tools to make sure their data is safely encrypted as it transmits from computer to unsecured wireless router to the internet. According to networking security website, FireEye, that concern is justified. The security team discovered a malicious document in several emails sent to "multiple companies in the hospitality industry, including hotels in at least seven European countries and one Middle Eastern country in early July." The document contained a macro that installs GAMEFISH malware, which is associated with a politically-motivated Russian hacking group known as APT28 (or Fancy Bear). This is allegedly the same group that hacked the Democratic National Committee ahead of last year's US election. Even worse, the tool used after the initial malware installation, EternalBlue, reportedly leaked from the NSA itself.
Source : https://www.engadget.com/2017/08/11/russian-hackers-can-reportedly-take-over-unsecured-hotel-wifi/