DEBULL Tooling Abuses Microsoft Device-Code Flow to Target M365 Accounts

1Key Takeaways

• Design, Tradeoffs, and Limitations TL;DR Summary The detection and mitigation design prioritized Conditional Access policies and simulated phishing resistance, but introduced latency overhead and edge-case brittleness.
• Design The core design leveraged Conditional Access policies in Azure AD to restrict M365 device code flow authentication, requiring supplemental verification (e.g., MFA) or device compliance checks.
• This builds on best practices for production readiness by embedding….