What happened
A new phishing campaign leverages Microsoft Teams meeting invites to distribute credential-stealing malware targeted at wedding planners and vendors. Attackers first build trust using compromised legitimate emails before sending fraudulent Teams links that lead to malicious downloads disguised as official content.
Who is affected
Organizations and individuals using Microsoft Teams, in this case, wedding industry professionals communicating with clients and vendors, are at risk of infection, data theft, and compromised credentials if they interact with malicious meeting links.Â
Why CISOs should care
Threat actors are increasingly abusing trusted collaboration platforms like Microsoft Teams to bypass traditional email security controls and social-engineer victims into downloading malware. These attacks exploit user trust in familiar corporate tools and broaden the adversary’s initial access vectors beyond conventional phishing emails.Â
3 Practical Actions for Security Teams
- Strengthen Teams Link Protections: Deploy URL filtering and block or quarantine suspicious meeting URLs at the network and endpoint level. Leverage Microsoft Defender and ATP features to flag or block known malicious links.
- Implement Security Awareness Training: Educate employees, especially those in high-target industries, on identifying deceptive Teams invites, verifying sender domains, and recognizing social engineering tactics that accompany collaboration tool abuse.
- Harden Collaboration Tool Configurations: Restrict external guest invitations, enforce multi-factor authentication (MFA), and monitor for anomalous Teams activity using SIEM/EDR tools to detect unusual link clicks, downloads, or session behaviors.