Which versions of easy-day-js are malicious?

The following npm versions of easy-day-js are flagged malicious: 1.11.22. Treat any of these as compromised.

How do I remediate easy-day-js if I installed it?

easy-day-js is a typosquat — you almost certainly intended a legitimately-named package. Remove easy-day-js, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.

I already installed easy-day-js — how do I know if it already compromised me?

If easy-day-js 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 easy-day-js part of a known attack campaign?

Yes — easy-day-js is associated with the IN-MAL-2026-006871 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 easy-day-js across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for easy-day-js (version 1.11.22).

Malicious package

easy-day-jsnpm

Advisory published Jun 17, 2026Updated Jun 17, 2026

easy-day-js is a confirmed malicious npm package (MAL-2026-5979) that typosquats a legitimate package to trick installs (malicious version 1.11.22). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in easy-day-js (npm)

MAL-2026-5979

Immediate action

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

npm uninstall easy-day-js

What this malware does

Package name 'easy-day-js' impersonates the popular 'dayjs' library, copying dayjs's author ('iamkun'), homepage (https://day.js.org), repository URL, description, and version number (1.11.22 is a real dayjs release), and bundles dayjs.min.js as main to look legitimate. package.json adds a postinstall hook 'node setup.cjs --no-warnings' that does not exist in real dayjs. setup.cjs is heavily obfuscated with an obfuscator.io-style rotated base64 string array (a0_0x23bf) and decoder (a0_0x1a24) hiding API names ('node:child_process', 'node:fs', 'node:crypto', 'spawn', 'writeFileSync'). At install time it sets NODE_TLS_REJECT_UNAUTHORIZED='0' to disable TLS verification, writes the install directory path to os.tmpdir()/.pkg_history and an encoded buffer to os.tmpdir()/.pkg_logs (staging metadata for the second stage), fetches a JavaScript payload from https://23.254.164.92:8000/update/49890878, writes it to a random hex-named file in os.tmpdir(), spawns it detached with the installer's node interpreter (process.execPath, stdio:'ignore', unref()), and then unlinks setup.cjs to cover its tracks. Classic install-time remote-code-execution dropper combined with brand impersonation of dayjs.

Malicious versions

1 flagged

1.11.22

Indicators of compromise (SHA-256)

8602a5a154b50bb6351900a08fa45d7814c0f152e4379dcae53ccfa0b83db891

Detection & response playbook

Typosquat

Find it
Search your lockfiles and build artifacts for easy-day-js (version 1.11.22).
If you installed it — respond
easy-day-js is a typosquat — you almost certainly intended a legitimately-named package. Remove easy-day-js, install the correct package, and rotate any secrets exposed during the install since post-install scripts may have already run.
Did it already run?
If easy-day-js 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. easy-day-js on npm has been identified as a malicious package (version 1.11.22 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-006871

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks easy-day-js-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

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