black hat
noun
: a hacker who infiltrates a computer system for malicious purposes (as to disable a website or uncover secret information)
In one segment … Assange reflects on his work as a black hat hacker in the early 1990s, recalling wistfully how he and others hacked into the Pentagon's Security Coordination Center.—Kim Zetter
compare white hat
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Merriam-Webster unabridged
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