A phishing campaign in multiple enterprise email environments purportedly protected by Proofpoint and Microsoft entices users with false event invitations in the form of .ics calendar invite attachments, Cofense Phishing Defense Center (PDC) reported.
The convoluted scheme dupes recipients into thinking their bank accounts have been compromised, even though the ruse’s initial focus is stuffing a malware into URL calendar invite, but in actuality is variation on the classic “suspicious activity on the user’s bank account.”
Cofense said it observed the use of several compromised accounts used to send this campaign. The loaded email contains the subject line “Fraud Detection from Message Center,” reeling in curious users. By using a compromised real account originating from Office 365, the phish is able to bypass email filters that rely on DKIM/SPF.
When the calendar invite is opened, it’s hosted on the legitimate Sharepoint.com, the web-based collaborative platform developed by Microsoft integrated with Microsoft Office. After clicking the link in the fake invitation, a relatively simple document opens with yet another link to follow.
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