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From foist +‎ -ware.


foistware (uncountable)

  1. (computing, derogatory) Software that is installed without the user's knowledge or consent, often bundled with another product.
    • 2003, William R. Cheswick, Steven M. Bellovin, Aviel D. Rubin, Firewalls and Internet security: repelling the wily hacker (page 241)
      They can acquire viruses, worms, foistware, and back doors.
    • 2003, "data64", What browsers are vulnerable to drive-by download (on newsgroup alt.privacy.spyware)
      Is it possible to block foistware using Proxomitron or Privoxy filters ?
    • 2004, "Sandi - Microsoft MVP", won't go to typed-in URL (on newsgroup
      It is essential to check for spyware/hijackware/foistware.