Answer: tampering

AnswerCrossword Clue
TAMPERINGActing like a hacker
TAMPERINGBeing meddlesome.
TAMPERINGMeddler's activity
tamperingTAMPER, to interfere in a harmful manner
tamperingExert a secret or corrupt influence upon (someone)
tamperingInterfere with (something) in order to cause damage or make unauthorized alterations