noun
A hacker who violates computer security for malicious reasons or personal gain, as opposed to a white hat hacker.
ブラックハットハッカーが企業のデータベースに侵入した。
A black hat hacker broke into the company's database.
彼はブラックハットハッカーとして
He is known as a black hat hacker and has been arrested several times in the past.