11/07/2025
The Hidden Danger Lurking in Your Next Video Call
Your team joins another Zoom or Teams meeting, cameras on, discussing quarterly targets or project updates. Everything appears normal. But security researchers have uncovered something troubling: cybercriminals can weaponize these everyday video calls to exfiltrate sensitive company data without detection.
The technique, dubbed "Ghost Calls," exploits how video conferencing platforms authenticate users. When employees join meetings, their devices receive temporary credentials for connection. Attackers who've already compromised a system can hijack these credentials, creating covert data channels that route through Zoom or Teams servers. Because corporate firewalls inherently trust these platforms, the malicious traffic masquerades as legitimate video call activity.
What makes this particularly dangerous is the encryption. End-to-end encrypted video traffic prevents most security tools from inspecting the data flowing through. The attack patterns mirror normal meeting behavior, leaving few traces. Even the temporary nature of meeting credentials works in attackers' favor, requiring only brief access windows.
This isn't a simple vulnerability requiring a patch. The issue stems from fundamental design choices that allow video conferencing to function behind restrictive corporate firewalls. While Zoom has implemented mitigations, the underlying risk persists.
Protecting your organization requires robust endpoint security, behavioral monitoring, and strict data access controls. If questions about your security monitoring capabilities keep you up at night, let's have a conversation about what comprehensive protection looks like for your business.