Okta / Midnight Blizzard Password-Spray Campaign
Since 2023, Russia's Midnight Blizzard (APT29) reset/password-spray campaigns against Microsoft 365 and Okta tenant administrators, across government and enterprise targets.
Midnight Blizzard (APT29) runs sustained password-spray and token-immune campaigns against cloud identity systems, including Okta and Microsoft 365 tenants, using compromised accounts to hunt tokens and mailboxes.
Definition
Credential-based intrusion campaign using low-and-slow password spraying against non-federated M365 and Okta tenants, followed by Microsoft Graph enumeration, mailbox access and targeted data theft.
Why It Matters / Impact
Confirmed M365 mailbox compromise against Microsoft itself (2024 disclosure) and multiple tenants; prompted guidance on legacy authentication protocols and token-lifetime controls.
Current Status
- Review status: published
- Last updated: 2026-08-26
- Evidence: 2 source(s) · 0 CVE(s) linked
- Confidence: 90%
Threat Actors
Timeline
- 2023-11-01 — Sustained spraying against Microsoft 365 tenants (approx.)
- 2024-01-12 — Microsoft discloses internal mailbox compromise
- 2024-03-01 — Aggressive blueprint phases disclosed; phishing uptick
Sources
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