Attackers have been impersonating notifications from Microsoft Teams in order to steal the credentials of employees. Recently, Microsoft Teams has seen one of the largest increases in users as a result of the shift to remote work given the ongoing COVID-19 pandemic.
Setup: Since the onset of the COVID-19 outbreak and the shift to remote work, there has been a remarkable increase in the usage of collaboration software. This particular attack impersonates Microsoft Teams, one of the leading collaboration software tools in widespread use.
Email Attack: These attackers crafted convincing emails that impersonate automated notification emails from Microsoft Teams. The landing pages that host both attacks look identical to the real webpages, and the imagery used is copied from actual notifications and emails from this provider. In one of the attacks, the sender email originates from a recently registered domain, “sharepointonline-irs.com”, which is not associated to either Microsoft or the IRS.
Payload: Attackers utilize numerous URL redirects in order to conceal the real URL used that hosts the attacks. This tactic is employed in an attempt to bypass malicious link detection used by email protection services:
In one attack, the email contains a link to a document on a domain used by an established email marketing provider to host static material used for campaigns. Within this document there is an image urging the recipient to log in to Microsoft Teams. Once the user clicks this image, the URL takes the recipient to a compromised page which impersonates the Microsoft Office login page.
In the other attack, the URL redirect is hosted on YouTube, then redirected twice to the final webpage which hosts another Microsoft login phishing credentials site.
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