North Korea for WannaCry -- a ransomware strain created by government hackers for the purpose of raising money for the regime, but which they lost control over.
The sanctions consist of a travel ban and an asset freeze.
EU citizens and businesses are also prohibited from engaging in transactions with entities on the sanctions list, which includes six individuals and three companies:
GAO Qiang (China)
ZHANG Shilong (China)
Alexey Valeryevich MININ (Russia)
Aleksei Sergeyvich MORENETS (Russia)
Evgenii Mikhaylovich SEREBRIAKOV (Russia)
Oleg Mikhaylovich SOTNIKOV (Russia)
Tianjin Huaying Haitai Science and Technology Development Co. Ltd (Huaying Haitai) (China)
Chosun Expo (North Korea)
Main Centre for Special Technologies (GTsST) of the Main Directorate of the General Staff of the Armed Forces of the Russian Federation (GU/GRU) (Russia)
EU officials said the two Chinese citizens were members of APT10, the Chinese hacking group behind Operation Cloud Hopper, while the four Russians were four GRU agents involved in the attempted hack against the WiFi network of the OPCW.
The EU said these are the first sanctions it imposed due to other countries launching cybre-attacks against member countries.
The US has already sanctioned some of the same individuals for the same cyber-attacks, and Washington has heavily pressured its trans-Atlantic partner to impose similar measures.
Furthermore, Germany has also recently asked its European partners for similar sanctions against Russia for the 2014 German Parliament (Bundestag) hack.