In this case, the attackers sent a phishing mail impersonating the Directeur général of the company IDELUX and claiming that he shared a message on SharePoint.
In this way the attackers bait the user into clicking on the malicious link which redirects him to a fake phishing form setup to steal his credentials.
Please note that the URL of the phishing link (which starts with idelux-be.com) looks quite similar to the original IDELUX website (which is idelux.be)
If you are uncertain about the authenticity of an email, do not hesitate to contact the entity that seems to have sent you the email using a safe communication manner, using the phone for example (no phone number from the untrusted email must be used in order to verify the authenticity).
If you are working for the Luxembourgish government or are using any of the GOVCERT.LU services, it is important to forward phishing emails to us (using Reporting an incident or the Outlook button). This will allow us to take down phishing websites and protect members of our constituency.