Business email compromise doesn't need to hack your bank it only needs to hack, spoof, or closely imitate an email thread you already trust, then slip in at the exact moment a payment or invoice is being discussed to redirect the money to a new account.
Attackers either gain real access to a mailbox through a prior phishing compromise, or send from a look-alike domain that's one letter off from the real one, then quietly join or hijack an ongoing invoice or closing conversation.
Right when a real payment is expected a supplier invoice, a house closing, a payroll change a message arrives claiming updated bank details, often with matching tone and thread history that makes it look like a normal continuation.
Any change to payment or bank details, no matter how it arrives, gets confirmed by phone using a number you already had on file never a number in the email itself before a cent moves.
Enable multi-factor authentication on every email account, flag external senders visually if your email provider supports it, and require a second person's sign-off on any payment detail change, no exceptions for 'urgent' requests.
The full guide covers BEC defense for individuals and small businesses.
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