Exploiting Microsoft Teams: The New Phishing Threat

Microsoft Teams is now deeply embedded in daily operations across countless organisations. With this level of adoption comes heightened attention from cybercriminals, who are exploiting Microsoft Teams to carry out highly convincing phishing campaigns and deliver stealthy malware.

These attacks are not only more advanced but often harder to detect at first glance.

Exploiting Microsoft Teams: A New Route for Social Engineering

Cyber criminals have adapted their methods, targeting users directly within Teams by impersonating IT support staff. They craft messages that appear genuine—perhaps a routine password check or system issue—designed to prompt immediate action.

Often, these messages are followed up by a voice call. Known as vishing, this technique allows attackers to guide the user through steps that unknowingly compromise their system.

To make matters worse, many of these attacks involve trusted remote access tools or legitimate system utilities. In some cases, attackers use DLL sideloading to hide malicious code inside what appears to be a safe application.

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Why These Attacks Work

Unlike email, Teams is seen by most users as an internal, secure platform. As a result, messages received through it are often trusted without hesitation.

Additionally, external access settings are not always correctly configured, leaving the door open for attackers to initiate chats posing as colleagues or support staff.

What Organisations Can Do to Stay Protected

To reduce the risk of criminals exploiting Microsoft Teams, organisations should take proactive steps to strengthen both platform security and user awareness.

Adjust external access settings
Firstly, review who can communicate with users from outside the organisation. Where appropriate, block or limit external contacts.
Provide regular training
Secondly, ensure staff understand that phishing isn’t just an email issue. Microsoft Teams, calls, and even calendar invites can all be used as attack vectors.
Create and communicate clear IT protocols
Establish standard procedures for how IT support will contact employees. Anything that deviates from this should raise a red flag.
Monitor for unusual activity
In addition, security tools should be configured to alert on unexpected logins, new software installations, or access requests outside normal behaviour.
Foster a culture of cautious verification
Encourage employees to double-check before taking action—especially if something feels off.

Final Thoughts

Clearly, attackers exploiting Microsoft Teams are becoming more skilled in blending in with everyday communications. Therefore, organisations must begin treating Teams like any other potential attack surface, not just a collaboration tool.

Furthermore, combining strong platform controls with well-informed users makes it significantly harder for attackers to succeed.

Exploiting Microsoft Teams: The New Phishing Threat