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FBI warns Kali365 phishing service is hijacking Microsoft 365 accounts through OAuth device-code logins

Updated: 2026.06.02 8D ago 4 sources
Scams & Fraud Social Engineering & Phishing
The FBI says criminals are using a Telegram-based service called Kali365 to trick people into granting access to their Microsoft 365 accounts. The phishing-as-a-service platform, first seen in April 2026, abuses Microsoft's legitimate device-code login flow so victims authorize attacker-initiated sessions; the stolen OAuth access and refresh tokens can then be reused to access Outlook, Teams and OneDrive without needing the victim's password or another multi-factor authentication prompt.
Why it matters: This matters because victims can lose control of email, files and collaboration accounts even if multi-factor authentication is enabled. Organizations using Microsoft 365 should urgently review device-code login controls and token protections, monitor for suspicious inbox rules and token use, and warn users not to enter login codes from unsolicited emails.

Sources

From Token Bingo to MAX Takeover: Kali365 Operator Expands Operation Across Microsoft Outlook, Okta, Xerox DocuShare, and Other Services
Arctic Wolf Labs 2026.06.02 94% relevant
This is the same underlying Kali365 operation and device-code phishing activity, but with substantive new details: Arctic Wolf links the operator to 126 malicious hosts, shows panel and token-capture infrastructure, and says the campaign has expanded beyond Microsoft 365 lures to Okta, Xerox DocuShare, GMX, Mail.ru, Yandex Disk, Odnoklassniki, and MAX Messenger account-takeover pages.
From Token Bingo to MAX Takeover: Kali365 Operator Expands Operation Across Microsoft Outlook, Okta, Xerox DocuShare, and Other Services
Arctic Wolf Labs 2026.06.02 97% relevant
This is a direct follow-up on the same Kali365 operation: it adds new technical detail about the operator’s infrastructure, a cluster of 126 malicious hosts, and expansion beyond Microsoft 365-themed lures into Outlook, Okta, Xerox DocuShare, AWS-themed pages, and a MAX Messenger account-takeover campaign while continuing to abuse Microsoft OAuth device authorization to bypass MFA.
FBI warns of Kali365 phishing service targeting Microsoft 365 accounts
Lawrence Abrams 2026.05.25 99% relevant
This article is the same underlying event: the FBI public warning on Kali365. It adds detail on Kali365's Telegram-based distribution, its two attack modes including the adversary-in-the-middle 'Cookie Link' option, links to prior Arctic Wolf reporting, and the FBI's recommended mitigations such as restricting device-code authentication and reviewing unauthorized device registrations.
FBI warns of Kali365 phishing-as-a-service after April Microsoft 365 attacks
2026.05.22 100% relevant
This article establishes a distinct tracked story by tying April 2026 Microsoft 365 account-takeover campaigns to the specific Kali365 phishing-as-a-service platform and adding the FBI's public warning plus operational details on how the abuse works.
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