All of the aforementioned techniques are largely a way for the threat actors to evade detection. Once the injected scripts, including the Morse code, come together they launch a fake Excel spreadsheet that prompts the victim to enter their Office 365 credentials. This, of course, is simply a method for attackers to steal an individual’s username and password.
It appears that this campaign is a targeted one, with specific businesses being attacked. Bleeping Computer reports that firms including Dimensional, Capital Four, Dea Capital, and several others are among those to have been sent malicious emails associated with this particular phishing threat.
As email security tools become increasingly sophisticated at preventing phishing emails from being delivered, threat actors are responding with intricate ways of avoiding detection. It will be interesting to see whether this Morse code attempt gains traction among other cyberattackers.