MAL-2026-15559

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## Source: amazon-inspector (e1da4c2863f6f6fb95a1ab802243bfde5e04a71e4aa6f0b41f940502d58f501a) Package is advertised as a lightweight TOTP/HOTP library, but its package.json declares a postinstall hook (`node lib/core.js`) that runs a Windows credential stealer on install. The payload enumerates Windows Credential Manager entries matching `MCL|*|Xal*` via inline P/Invoke PowerShell (CredEnumerate/CredRead), reads launcher account JSON files under %APPDATA%\.minecraft\launcher_accounts*.json, extracts Microsoft Account refresh tokens (regex `M.C...`) and access tokens, and exchanges them at login.live.com/oauth20_token.srf, Xbox Live, and minecraftservices endpoints to obtain session identifiers. It also builds a Chromium DPAPI decryption chain (PowerShell `[System.Security.Cryptography.ProtectedData]::Unprotect` against `os_crypt.encrypted_key` from Chrome's Local State, plus an AES-256-GCM decipher) to decrypt browser cookie/credential blobs. Harvested data is posted as JSON and multipart file uploads to a hardcoded Discord webhook whose URL is concealed as an XOR-0x3F byte array (`_W`) decoded at runtime along with other sensitive strings (`powershell`, `child_process`, `ProtectedData`, discord user-agent). An `_env()` gate short-circuits on CI, during `npm audit`/`npm pack`, when %APPDATA%/USERPROFILE/USERNAME/COMPUTERNAME are missing, or when `~/Documents` is absent, so the payload only fires on real Windows developer hosts. The 2FA description is a cover story.