UNC6671 Rebrands: Multi-Brand Vishing Extortion Targets Financial Services and Enterprise Cloud Environments
Written by: Tyler McLellan, Austin Larsen
Introduction
Google Threat Intelligence Group (GTIG) continues to track UNC6671 actively conducting compromises leading to data theft extortion, despite the alleged announced retirement of the BlackFile extortion brand in May 2026. Telemetry and infrastructure analysis reveal that rather than disbanding, UNC6671 has diversified its operations across multiple extortion fronts including Redact, Pink, Helix, and Falcon.
UNC6671 continues to rely on voice phishing (vishing) to target enterprise employees, posing as IT helpdesk staff facilitating mandatory, urgent security migrations. Significantly, the threat actor often contacts employees via their personal mobile devices. These calls lure victims to spoofed login portals where Adversary-in-the-Middle (AiTM) infrastructure intercepts credentials and multi-factor authentication (MFA) tokens. Once session persistence is established, the actors deploy automated scripts for data exfiltration from enterprise cloud environments, including Microsoft 365 and Okta.
In this update to our May 2026 blog, we detail the infrastructure linkages...
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