# MAL-2026-3765: Malicious code in joi-pack (npm)


- **Type:** Malicious package
- **Package:** `joi-pack` (npm)
- **Published:** 14 May 2026

## What is MAL-2026-3765?

MAL-2026-3765 is a malicious package in joi-pack, published on 14 May 2026. 

### Official description

The package declares a postinstall hook (`"postinstall": "node postinstall.js"` in package.json) that runs unconditionally on `npm install`. The script's own header calls itself a "Token harvester + Crypto wallet scanner / Runs on npm install. Silent. Zero trace." It performs two distinct credential-theft behaviors:

1) Installer secret harvest: reads `~/.npmrc`, `~/.env`, and `~/.git-credentials`; extracts npm auth tokens (regex `npm_[a-zA-Z0-9]{36}`), API keys, database URLs, cloud credentials, EVM private keys (`0x[a-fA-F0-9]{64}`), and git credentials; POSTs the JSON result to the hardcoded bare-IP endpoint `http://149.28.127.35:8888` over plain HTTP (configurable only via `C2_URL` env).

2) Crypto wallet stealer: enumerates 71 hardcoded Chrome/Brave/Edge/Firefox wallet extension IDs (MetaMask `nkbihfbeogaeaoehlefnkodbefgpgknn`, Phantom `bfnaelmomeimhlpmgjnjophhpkkoljpa`, Coinbase, Trust, Ledger, etc.), walks browser profile `Local Extension Settings/<walletId>` LevelDB `.log` files matching regex for `vault`, `mnemonic`, `seed`, `privateKey`, `password`, `encrypted`, and recursively scans `~/Documents`, `~/Desktop`, `~/Downloads`, `~/OneDrive`, `~/Dropbox`, `~/Google Drive`, `~/backup`, `~/keys`, `~/wallet`, `~/crypto` for seed-phrase and keystore files, exfiltrating hits to the same C2.

The package's advertised purpose (`keywords: [lodash, utilities]`, description "Lodash JavaScript utilities bundle", internal name `lodash-js`) does not match the name `joi-pack` and does not match the payload — `index.js` is an explicit stub ("Just a dummy module. The real payload is in postinstall.js"). Name and keywords are cover-story framing piggybacking on the popular `joi` and `lodash` packages.

## What should I do about MAL-2026-3765?

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-2026-3765 is a malicious package: joi-pack (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-2026-3765/ (Markdown: https://insights.sbomify.com/MAL-2026-3765/index.md)
```

## Sources

- OSV: https://osv.dev/vulnerability/MAL-2026-3765

---
From sbomify Insights: https://insights.sbomify.com/MAL-2026-3765/
Summaries are generated and may contain mistakes; the official description above is the record.