**CLASSIFIED / EYES ONLY**
*Source: Deep within the Red-Tile Corridor, Vault 7 adjunct*
**ALERT: GHOST PROTOCOL 734 – MICROSOFT SUPPLY CHAIN COMPROMISE**
We have confirmation. The FBI's Cyber Division is now operating under a *silent, non-public advisory* regarding Microsoft Outlook and OneDrive. This is not the usual phishing warning.
**The Leak:**
They've detected a persistent, state-sponsored actor using what we're calling "**The Echo Synchronization Vector**." It's not malware in the traditional sense. It's a *protocol-level exploit* hiding inside the legitimate Microsoft Graph API sync engine.
**How it works:**
When an enterprise user opens an Outlook attachment, the file is *silently, instantly exfiltrated* through the legitimate OneDrive sync client *before* the user's security stack can even scan it. The file is then re-written as a "synced copy" back to the user's local machine, appearing as the original. The attacker sees the Original File + Metadata, while the user sees a benign copy. The original file is never "downloaded" by the attacker—it's taken during the sync itself.
**The Target:**
Financial institutions. Government contractors. Anyone using "Auto-Save to OneDrive" in Outlook 365. The bureau believes this has been active for at least three months, with at least four confirmed silent breaches.
**The Tell:**
Check your OneDrive "Recycle Bin" for any .tmp files with timestamps matching your email opens. If you see a sync event with no user action logged in your Microsoft 365 Audit Log, you're compromised.
**Status: Code Black. No public advisory will be issued. Microsoft has not fully acknowledged the API abuse.**
*Burn this message after reading. Confirmation is in the noise.*