FIDO/passkey downgrade AiTM — "passkey unavailable, use password/SMS/authenticator instead" (Proofpoint Evilginx phishlet)
fido-passkey-downgrade-lure
What this tier means
High-confidence threat indicator — phishing, impersonation, BEC, or scam pattern. Strong contributor to the trash decision.
How Gorganizer detects this
Body frames a passkey, FIDO, WebAuthn, security key, or biometric sign-in as "temporarily unavailable / not supported / failed" OR instructs the recipient to remove/reset their passkey and fall back to password, SMS, authenticator app, or OTP — the phish-resistant-auth downgrade pattern pioneered by Proofpoint-documented Evilginx phishlets (Jul 2025). The phishlet spoofs Safari-on-Windows user agents so Entra ID returns a passkey error and falls back to weaker MFA. BleepingComputer, DarkReading, and WorkOS confirmed the attack class. Distinct from oauth-consent-phishing and aitm-session-cookie-phishing-lure which target the surrounding OAuth or session flows.
False-positive guard
Every signal in Gorganizer feeds a multi-module score — never a sole verdict. This is a threat-tier signal — it adds a strong contribution to the trash score. The full pipeline still requires convergence across multiple modules + a margin over the safety floor before deletion happens, and Gmail's trash (30-day recovery) is always used — never permanent delete.
About the scoring engine
Gorganizer's scoring engine emits over 1,800 signals across six modules — headers, sender, subject, body, attachments, and structural metadata. Every email is scored by every module independently; the final verdict requires multiple modules to agree and the trash score to beat the safety floor by a margin.
Sacred safety guards — never delete starred emails, replies, calendar invites, receipts/invoices, or attachments — apply unconditionally regardless of any signal.
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