Business email accounts are valuable to criminals because they can be used for fraud and impersonation.
Stolen business credentials may be sold or shared in underground markets.
Once an attacker gains access to a mailbox, they can study how the company communicates. They may learn who approves payments, which vendors are used, and when large transactions are expected.
The attacker can then create convincing messages that look like normal business activity.
This is one reason dark web exposure matters even if the stolen password came from another website.
Businesses should require MFA, monitor unusual sign-ins, and train employees to verify financial changes through a second communication method.
The more useful the mailbox is to the criminal, the more important it is to protect the identity behind it.