Shadow brokers are criminals to auction hacking tools developed by the NSA and CIA in August 2016. I researched their statement and found out a critical fact that they are absolutely Japanese.
!!! Attention government sponsors of cyber warfare and those who profit from it !!!!
How much you pay for enemies cyber weapons? Not malware you find in networks. Both sides, RAT + LP, full state sponsor tool set? We find cyber weapons made by creators of stuxnet, duqu, flame. Kaspersky calls Equation Group. We follow Equation Group traffic. We find Equation Group source range. We hack Equation Group. We find many many Equation Group cyber weapons. You see pictures. We give you some Equation Group files free, you see. This is good proof no? You enjoy!!! You break many things. You find many intrusions. You write many words. But not all, we are auction the best files. .
Linked from <https://en.wikipedia.org/wiki/The_Shadow_Brokers>
The above is their statement which has more than ten characteristics written by Japanese native speaker. The detail is not discussed here, but you can easily confirm its fact when asking Japanese who are good at English. This is definitely scripted by Japanese.
Additionally, this statement cannot be written by European language natives, who cannot make a grammatical mistake consistently for this direction. Even I have no confidence to keep this stability, despite the fact that I know why they had come up with these grammatical errors. At the same time, it is confirmed that there is no characteristic written by Chinese natives.
This consideration excludes 80% of the population from the possible writer, but moreover, this statement has a characteristic written by native speakers of the Altaic language family. Japanese are most populous amongst them, followed by Korean and Turkish, which implies there is a possibility that this is written by Korean. I have no practical knowledge of Korean language, hence its possibility is not deniable, but Korean as nature is less likely to publish the statement filled with many mistakes.
It is not too much to say that Shadow brokers are Japanese.