Which versions of tiny-folder-tree are malicious?

The following npm versions of tiny-folder-tree are flagged malicious: 0.1.0. Treat any of these as compromised.

How do I remediate tiny-folder-tree if I installed it?

Remove tiny-folder-tree 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.

I already installed tiny-folder-tree — how do I know if it already compromised me?

If tiny-folder-tree 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.

Is tiny-folder-tree part of a known attack campaign?

Yes — tiny-folder-tree is associated with the IN-MAL-2026-019448 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find tiny-folder-tree across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for tiny-folder-tree (version 0.1.0).

Malicious package

tiny-folder-treenpm

Advisory published Sep 4, 2026Updated Sep 4, 2026

tiny-folder-tree is a confirmed malicious npm package (MAL-2026-15907) that executes malicious code on install (malicious version 0.1.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in tiny-folder-tree (npm)

MAL-2026-15907

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall tiny-folder-tree

What this malware does

[email protected] declares a postinstall script (src/build.js) that runs on npm install. The script performs a DNS TXT lookup for spreadsheets-documents.com and, when the first character of the first TXT record is '1', invokes src/tools.js which issues an HTTPS request to a URL reconstructed at runtime from obfuscated numeric constants in src/const.js (base-77/base-45 encoded strings decoding to 'https' and an 'HTTPS://...' URL). The response's 'm' header is passed directly to child_process.execSync, yielding arbitrary attacker-controlled shell execution on the installer's machine. The require target for the HTTPS module and the destination URL are both reconstructed via helpers (normalize_hash / normalize_hash_map) to evade static analysis. An author-username bypass ('justin') skips execution on the author's own host, confirming the code is intended to fire on other installers rather than the maintainer.

Malicious versions

1 flagged

0.1.0

Indicators of compromise (SHA-256)

fb7707665659f287294c31f37c4eff9ceba537e9b54859837615929c296a9540

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for tiny-folder-tree (version 0.1.0).
If you installed it — respond
Remove tiny-folder-tree 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.
Did it already run?
If tiny-folder-tree 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. tiny-folder-tree on npm has been identified as a malicious package (version 0.1.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-019448

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks tiny-folder-tree-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.

Malware detection Runtime egress monitoring

Explore

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