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.

Please register to continue.

Already registered? Log in.

Once you register, you'll receive:

  • News analysis

    The context and insight you need to stay abreast of the most important developments in cybersecurity. CISO and practitioner perspectives; strategy and tactics; solutions and innovation; policy and regulation.

  • Archives

    Unlimited access to nearly 20 years of SC Media industry analysis and news-you-can-use.

  • Daily Newswire

    SC Media’s essential morning briefing for cybersecurity professionals.

  • Learning Express

    One-click access to our extensive program of virtual events, with convenient calendar reminders and ability to earn CISSP credits.