In a public service announcement, the F.B.I. has publicized a new internet risk for business that goes beyond Russian hacking of political parties.  It is a sophisticated scam targeting businesses that work with foreign suppliers and that regularly perform wire transfer payments.  E-mail accounts are hacked, hijacked, and used by criminals to authorize bogus business payments.  The scam has been reported by victims in all 50 states and in 100 countries.  Fraudulent transfers have been sent to 79 countries, with the majority going to Asian banks in China and Hong Kong.  Simon H. Prisk examines how the scam works and advises caveat solventis.