Dark web merchants have been observed selling a new tool that allows cybercriminals to plant malicious emails into users’ inboxes by secretly accessing their accounts and then abusing a special Internet Message Access Protocol (IMAP) feature that allows you to append a message.
Because the attacker never actually sends an email over the internet, the email essentially bypasses certain email security solutions that would ordinarily detect and filter out the malicious message while en route to the recipient.
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