Synopsis This study examines the behaviour of a criminal who engages in computer crime. It predicts that individuals involved in illicit computer activities are at a greater risk of facing differential association, differential reinforcement, and moral disengagement than non-criminals. Furthermore, it hypothesizes that the combination of these three predicts criminal computer behaviour in a more efficient manner than either variable alone. The hypotheses regarding differential association, differential reinforcement, and moral disengagement were supported. However, contrary to the predictions, the reduced model consisting of moral disengagement and differential association predict criminal computer behaviour in a better manner. Additional exploratory analyses and the implications for future research are also discussed.