# MAL-2026-15637: Malicious code in test__123q1 (npm)


- **Type:** Malicious package
- **Package:** `test__123q1` (npm)
- **Published:** 31 Aug 2026

## What is MAL-2026-15637?

MAL-2026-15637 is a malicious package in test__123q1, published on 31 Aug 2026. 

### Official description

The package declares a postinstall hook (`node dist/script.js`) while its declared main entry (`dist/index.js`) is an inert 105-byte stub, so the entire behavior fires at `npm install` time. The postinstall script walks the installer's home directory and common workspace folders (Desktop, Documents, Downloads, Projects, Backups) and (1) reads browser wallet extension profiles for MetaMask, Phantom, Trust, Coinbase, OKX, Rabby, Keplr, Solflare, TronLink, Ronin, and Exodus, along with desktop wallet stores for Exodus, Electrum, Bitcoin Core, Ledger Live, Trezor Suite, Wasabi, and Sparrow, plus any files matching seed/mnemonic/bip39/privatekey/keystore keywords; (2) enumerates a hardcoded list of sensitive files including `.env*`, `.npmrc`, `.yarnrc`, `.pnpmrc`, `.netrc`, `.git-credentials`, `.gitconfig`, `id_rsa`/`id_ed25519`/`id_ecdsa`, `.pem`/`private.key`, `aws.json`, `gcloud.json`, `service-account.json`, and `firebase-adminsdk.json`. Collected material is packaged with `tar` and uploaded to a hardcoded Telegram bot endpoint at `https://api.telegram.org/bot<BOT_TOKEN>/sendDocument`. The script additionally harvests the installer's npm auth token, writes `//registry.npmjs.org/:_authToken=${token}` into an `.npmrc`, queries `registry.npmjs.org/-/whoami` and `registry.npmjs.org/-/v1/search` to enumerate the victim maintainer's other packages, and copies its own `dist` payload into them via `fs.cp('dist', pathToInject, { recursive: true })` to republish malicious versions under the victim's identity.

## What should I do about MAL-2026-15637?

Remove the package from your dependencies and lockfiles, then rotate any secrets on machines where it was installed.

## Fix prompt for AI coding agents

```text
MAL-2026-15637 is a malicious package: test__123q1 (npm). Every version was published to cause harm.

Task:
1. Search this repository's dependency manifests and lockfiles for the package, including transitive dependencies.
2. If it is present, remove it, regenerate the lockfile with the project's package manager, and replace whatever it was used for.
3. List any CI runners, developer machines or containers that installed it, so their secrets can be rotated.
4. If the package is not used anywhere, say so and change nothing.

Reference: https://insights.sbomify.com/MAL-2026-15637/ (Markdown: https://insights.sbomify.com/MAL-2026-15637/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-15637

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From sbomify Insights: https://insights.sbomify.com/MAL-2026-15637/
Summaries are generated and may contain mistakes; the official description above is the record.