noun
Wasei-eigo term for a malicious hacker who exploits systems for illegal or unethical purposes. Equivalent to English 'black hat hacker'.
wasei-eigo (Japanese-coined English), from black hacker
ブラックハッカーが企業のサーバーに不正アクセスした。
A black hat hacker gained unauthorized access to the company's server.
Security experts study the methods of black hat hackers.