Hypothesis A: These are European hackers. Hypothesis B: There are North Korean hackers who have mastered English, an enemy language whose speakers they have al

Hypothesis A: These are European hackers. Hypothesis B: There are North Korean hackers who have mastered English, an enemy language whose speakers they have almost no interactive exposure to, to such an extent that they can, in real time, simulate the subtle mannerisms of another, completely unrelated set of non-native speakers of English. Take your pick.