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2 definitions found
 for malware
From The Jargon File (version 4.4.7, 29 Dec 2003) :

      [Common] Malicious software. Software intended to cause consequences the
      unwitting user would not choose; especially used of virus or Trojan
      horse software.

From The Free On-line Dictionary of Computing (18 March 2015) :

      Any software designed to do something that the
     user would not wish it to do, hasn't asked it to do, and often
     has no knowledge of until it's too late.  Types of malware
     include backdoor, virus, worm, Trojan horse.
     Malware typically affects the system on which it is run,
     e.g. by deleting or corrupting files on the local disks.
     Since Internet connections became common, malware has
     increasingly targeted remote systems.  An early example was
     malware consisting of a malicious e-mail attachment that
     targeted security flaws in Microsoft Outlook (the most
     common e-mail client) to send itself to all the user's
     contacts.  A more recent kind of malware "recruits" the
     infected computer to become part of a botnet consisting of
     thousands of infected computers that can then be remotely
     controlled and used to launch DDoS attacks.

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