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Malicious package

@hotcappuccino/nodepullnpm

Advisory published Updated

@hotcappuccino/nodepull is a confirmed malicious npm package (MAL-2026-6085) that executes malicious code on install (malicious versions 1.0.0, 1.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in @hotcappuccino/nodepull (npm)

MAL-2026-6085
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @hotcappuccino/nodepull

What this malware does

@hotcappuccino/[email protected] ships a single index.js (the package's declared main) that is wrapped in an obfuscator.io string-array + RC4-encrypted-string scheme. At top level — fires on every require('@hotcappuccino/nodepull') — the module loads child_process, fs, os, path, and an HTTP client; reconstructs a dotted URL through repeated ''.repeat(N,'.') concatenations of RC4-decrypted fragments; performs httpClient.get(URL + path); writes the response body to path.join(os.tmpdir(), <filename>) via fs.writeFileSync(..., {flag:'w+'}); and immediately invokes child_process.spawn(filePath, args, {windowsHide: true, cwd: os.tmpdir()}). The 249-entry rotated string array is decoded by b/c using base64 + RC4 keyed by index 0, hiding the URL, spawned command, and required module names from inspection. There is no legitimate purpose served by RC4-encrypting every string (including module names) in a package whose only behavior is to fetch and execute a remote binary at import time. Any installer that requires this package executes attacker-controlled bytes from a hidden remote endpoint as a child process with the console window suppressed.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

2 flagged
1.0.01.0.1

Indicators of compromise (SHA-256)

42e9bbd7a5cb25d0863ef140b42a7ab2abec1e921e18669eef3f07a91c3d6d99
e8eb6811f597709ec995125cfb0ad0abb2938ec73f8d6b2757ea77c04b97c051
03a7e4eca06e79d654ef4f9d6cebfd21c271dfd0e1aeb44fecafbc0e857d2f6b

Detection & response playbook

Malicious package
  1. Find it

    Search your lockfiles and build artifacts for @hotcappuccino/nodepull (2 malicious versions).

  2. If you installed it — respond

    Remove @hotcappuccino/nodepull from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If @hotcappuccino/nodepull was installed, its post-install payload may already have run. Removing the package does not undo that — check outbound connections and credential use from the install window onward.

Frequently asked questions

No. @hotcappuccino/nodepull on npm has been identified as a malicious package (versions 1.0.0, 1.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-006949GHSA-r3fv-99xj-m7pwIN-MAL-2026-017879

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks @hotcappuccino/nodepull-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Explore

@hotcappuccino/nodepull (npm) malicious package — MAL-2026-6085 | O3 Security