Microsoft Teams Users Exploited In Sophisticated Multi-Stage AI Attack
Apr 01, 2025 - forbes.com
A sophisticated multi-stage hack targeting Microsoft Teams users has been identified by security researchers at the Ontinue Cyber Defence Centre. The attack begins with a Microsoft Teams message delivering a malicious PowerShell payload, which, through remote access tools and JavaScript-based backdoors, gains initial access and persistence on victim devices. This attack chain demonstrates how a simple vishing-based social engineering tactic can escalate into a full-scale compromise when combined with trusted tooling, signed binaries, and stealthy second-stage payloads. The researchers noted similarities with a threat actor known as Storm-1811 but could not attribute the attacks with high confidence.
To mitigate such attacks, experts emphasize the importance of real-time scanning across all communication channels, not just email, as these attacks often start with social engineering. Advanced protection methods, including computer vision, natural language processing, and behavioral analysis, are recommended to identify sophisticated attacks even when they use legitimate-looking tools. Security teams should be vigilant for Microsoft Teams messages containing PowerShell commands, unexpected use of QuickAssist, and signed binaries running from nonstandard locations.
Key takeaways:
Microsoft Teams was used in a sophisticated multi-stage hack attack involving a malicious PowerShell payload.
The attack chain began with a phishing message via Microsoft Teams and involved remote access tools and a JavaScript-based backdoor.
Security experts emphasize the need for real-time scanning across all communication channels to detect such sophisticated attacks.
Indicators of compromise include unexpected use of QuickAssist and signed binaries running from nonstandard locations.
