Steam Mobile Authenticator migration phishing — email claims Steam Guard is migrating to a new app and the recipient must re-link their phone/re-scan QR at a non-steam.com URL, harvesting Steam Guard TOTP + session cookies. Valve/Steam community phish reports; PC Gamer 2026.
steam-mobile-authenticator-migration-phish
What this tier means
High-confidence threat indicator — phishing, impersonation, BEC, or scam pattern. Strong contributor to the trash decision.
How Gorganizer detects this
Email impersonating Valve/Steam claiming the recipient must migrate to the new Steam Mobile Authenticator (following Valve's April 2024 forced-upgrade policy) or face a 15-day trading hold and eventual revocation of Steam marketplace trading privileges. The phishing email leads to an Adversary-in-the-Middle (AiTM) credential-harvesting page. This attack exploits genuine user confusion: Valve's real policy change created a population of confused Steam users who received legitimate migration reminders, making fake reminders indistinguishable. Group-IB's January 2026 report documented a sustained 2025-2026 Steam authenticator phishing wave; ESET's Q4 2025 research traced AiTM chain attacks using the authenticator-migration lure. Distinct from the existing fake-steam-gaming-account-phish (account suspension/ban language without authenticator-migration specificity). The 15-day trading hold language and "Steam Guard mobile authenticator migration" keywords are highly diagnostic.
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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