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FBI warns of Kali365 phishing tool bypassing MFA on Microsoft 365

other · 2026-05-26

The FBI has issued a warning about Kali365, a new phishing tool distributed via Telegram since April, which allows attackers to steal OAuth tokens and access Microsoft 365 services including Outlook, Teams, and OneDrive without needing a password, effectively bypassing two-factor authentication.

Key facts

  • Kali365 is a phishing tool distributed via Telegram since April.
  • It steals OAuth tokens to bypass two-factor authentication.
  • Attackers can access Outlook, Teams, and OneDrive without a password.
  • The FBI issued a warning about this tool targeting Microsoft 365 users.

Entities

Institutions

  • FBI
  • Microsoft

Sources