The FBI is again warning businesses to be aware of a growing scam that tricks them into paying invoices from established partners that look legitimate but in fact are fraudulent. The IRS has seen a surge of these phone calls being made by criminals impersonating IRS agents. The FBI says the fraud is a tweak of the man-in-the-middle scam and usually involves chief technology officers, chief financial officers, or comptrollers, receiving an e-mail purportedly from a vendor requesting a wire transfer to a designated bank account.”]