A threat group dubbed "Spring Ring" is conducting vishing attacks against Microsoft Teams users, according to a report from Dark Reading. The operation aims to compromise accounts by deceiving users over voice calls, a technique that exploits trust in real-time communication. Once access is gained, the attackers can remotely control sessions, spread malware, and potentially seize control of broader infrastructure.
The campaign highlights the growing sophistication of social engineering in enterprise environments. Rather than relying on phishing emails, the group leverages voice calls to bypass traditional security awareness. This approach can be particularly effective because it feels more personal and urgent, increasing the likelihood that a user will comply with requests for credentials or multi-factor authentication codes.
Organizations using Microsoft Teams should be aware of this threat and reinforce training on verifying unsolicited calls. The report does not specify the scale of the attacks or the sectors targeted, but the potential impact on business operations is significant. As collaboration tools become central to workflows, securing them against such targeted vishing campaigns is critical.