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Fullz is a term used by criminals to describe sets of stolen personal information that can be used to impersonate someone or to use their bank cards. Fullz are stolen identities or stolen credit card information. The expression comes from the word “full” in the sense of “full data” or “full credentials” and encompasses all the information a bad actor needs to impersonate someone in order to defraud an organization, steal directly from the victim, or conduct illicit activity that will be attributed to an innocent victim if the perpetrator is caught.