WordNet (r) 3.0 (2006):

cybercrime
    n 1: crime committed using a computer and the internet to steal
         a person's identity or sell contraband or stalk victims or
         disrupt operations with malevolent programs

The Free On-line Dictionary of Computing (30 December 2018):

cybercrime

    Any of a broad range of activities that use
   computers or networks to commit illegal acts, including theft of
   personal data, phishing, distribution of malware,
   copyright infringement, denial of service attacks,
   cyberstalking, bullying, online harassment, child
   pornography, child predation, stock market manipulation and
   corporate espionage.

   For example, a vulnerability in a victim's web browser might
   result in him unknowingly downloading a Trojan horse virus,
   which installs a keystroke logger on his computer, which allows
   the cracker to steal private data such as Internet banking or
   e-mail passwords.

   The degree to which an activity counts as "cybercrime" rather than
   just "crime" depends on whether they could exist without computers
   or networks.

   (2015-02-14)