Thread:NewGenTV/@comment-5238398-20161116220301/@comment-24527343-20161215090949

I don't believe so, I think I remember something like that happening. Apparently it was by a team of hackers calling themselves "OurMine" or something like that (per a 2-second google search of "markiplier channel hacked".

If you search that on his channel itself, nothing of relevance appears, so no, I don't think he addressed it, or at least not in an entire video. Perhaps as a topic in one of his vlogs or something, but I'm not about to dig for it.