INCIDENT EVIDENCE GRAPH

Microsoft Teams vishing attacks lead to Chaos ransomware attacks

2026-07-30T15:56:33Z

Threat actors are impersonating IT support staff in Microsoft Teams calls to gain remote access to corporate devices and deploy Chaos ransomware in attacks targeting North American organizations. [...]

• Victim: North American organizations
• Actor: Threat actors impersonating IT support staff
• Method: Microsoft Teams vishing calls used to gain remote access and deploy Chaos ransomware

Primary evidence

1. Microsoft Teams vishing attacks lead to Chaos ransomware attacks

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