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Re:The NSA has linked the WannaCry computer worm to North Korea by atlantique on Thursday June 15, 2017 @08:07AM (#14559598)
Not every IME has fuzzy pinyin and I don't think the Microsoft one has it enabled by default.
Re:The NSA has linked the WannaCry computer worm to North Korea by paradite on Thursday June 15, 2017 @08:36AM (#14559783)
Yeah. You are right about that. So I am not ruling out the possibility that someone who mispronounces the word was the author.

Still the odds are low, considering this is a common phrase and he/she has likely made similar mistakes before (zh -> z) and taken some corrective actions to prevent future typos.