Hedge fund cyberattacks tied to BlackFile-linked UNC6671 extortion group

A cybercriminal group tracked as UNC6671, previously known as BlackFile, has been conducting vishing attacks against hedge funds, private-equity firms, and other financial organizations. The attackers spoof corporate helpdesks and trick employees into visiting phishing domains that steal credentials and session cookies via adversary-in-the-middle kits. After gaining access to Microsoft 365 or Okta single-sign-on accounts, they exfiltrate data from linked cloud services and suppress detection by deleting security notifications. The group has diversified its extortion operations under multiple brand names including Redact, Pink, Helix, and Falcon, though Falcon claims it is only affiliated with Redact.

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