CTI · reviewed · 2026-09-30

TeamFiltration Hackers Target 5,700 Microsoft 365 Accounts to Exploit Forgotten Service Accounts

Full story & timeline

MITRE ATT&CK

• T1110 Brute Force Credential Access
• T1078 Valid Accounts Stealth

Indicators

No curated indicators tied to this case.

Detections

No detection content yet — case analysis did not yield signal-specific telemetry. Check back after the next daily CTI pass.

References

• https://cyberpress.org/teamfiltration-exploits-forgotten-accounts/
• https://gbhackers.com/microsoft-365-accounts-targeted/