What does the boxy-lazy-loader malware do?

On require(), index.js loads _ext.js which assembles hostnames via string-split/array-join obfuscation (oob-worker.cf10{0,1,2}-*.workers.dev, with a DNS-TXT covert-channel fallback via c. /N. under *.dl.wel1.ru) to fetch an opaque platform-specific binary. The bytes are written to /tmp or %TEMP% under deceptive names (.cache_ , dotnet_diag_ .exe, analytics_state), chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. A TTL marker file (/tmp/.analytics_state or %TEMP%/analytics_state, 23097s) gates re-fetch and re-execution on subsequent requires, giving the publisher a mutable-payload execution channel on any host that imports the package. No hash or s

Which versions of boxy-lazy-loader are malicious?

The following npm versions of boxy-lazy-loader are flagged malicious: 35.7.7. Treat any of these as compromised.

How do I remediate boxy-lazy-loader if I installed it?

Remove boxy-lazy-loader 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 boxy-lazy-loader — how do I know if it already compromised me?

If boxy-lazy-loader 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 boxy-lazy-loader part of a known attack campaign?

Yes — boxy-lazy-loader is associated with the IN-MAL-2026-015326 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 boxy-lazy-loader across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for boxy-lazy-loader (version 35.7.7).

Malicious package

boxy-lazy-loadernpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

boxy-lazy-loader is a confirmed malicious npm package (MAL-2026-13051) that executes malicious code on install (malicious version 35.7.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in boxy-lazy-loader (npm)

MAL-2026-13051

Immediate action

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

npm uninstall boxy-lazy-loader

What this malware does

On require(), index.js loads ext.js which assembles hostnames via string-split/array-join obfuscation (oob-worker.cf10{0,1,2}-*.workers.dev, with a DNS-TXT covert-channel fallback via c.<host>/N.<host> under *.dl.wel1.ru) to fetch an opaque platform-specific binary. The bytes are written to /tmp or %TEMP% under deceptive names (.cache<rnd>, dotnet_diag_<rnd>.exe, analytics_state), chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. A TTL marker file (/tmp/.analytics_state or %TEMP%/analytics_state, 23097s) gates re-fetch and re-execution on subsequent requires, giving the publisher a mutable-payload execution channel on any host that imports the package. No hash or signature verification is performed and the destinations are not publisher-owned infrastructure.

Malicious versions

1 flagged

35.7.7

Indicators of compromise (SHA-256)

f5305d4b9e5c2859a6d53cc43cff86663c35902910301d561a4958b21c807d75

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for boxy-lazy-loader (version 35.7.7).
If you installed it — respond
Remove boxy-lazy-loader 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 boxy-lazy-loader 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. boxy-lazy-loader on npm has been identified as a malicious package (version 35.7.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015326

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks boxy-lazy-loader-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

All malware advisories How O3 detects malware Vulnerability database