Spear phishing is the largest and most costly form of cyber threat, with an estimated 300,000 reported victims in 2021 representing $44 million in reported losses in the United States alone. Business e-mail compromises led to $2.4 billion in costs in 2021, according to the FBI Internet Crime Report. In the period from June 2016 to December 2021, costs related to phishing and spear phishing totaled��
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