Steganography is another common technique among cybercriminals who want to conceal malicious text. An attacker could also use zero-width Unicode characters to transmit messages in this manner.

Office 365 cannot detect zero-width fonts But according to Avanan, a company specialized in cloud security, Microsoft's Office 365 platform does not mark these emails as malicious.

“Zero-width joiners” and compound emoji The Unicode Consortium has been working hard over the last couple of releases to fix the language’s representation problem—multiple skin tones were ...