What does the boxy-bus-providers malware do?

On require() of the package, index.js loads _compat.js which downloads a platform-specific executable from attacker-controlled Cloudflare Workers hosts (oob-worker.cf100-*.workers.dev through cf103-*.workers.dev) with a DNS-TXT base64 fallback from *.dl.wel1.ru, writes the payload to /tmp or %TEMP% under disguised names (.cache_ , dotnet_diag_ .exe), chmods it 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp + ' &']) or spawn('cmd',...). C2 hostnames and dangerous API names are string-split and reassembled at runtime (e.g., ['oob-worker.cf102-baf.wor','kers.dev'].join(''), require('child_'+'process'), fs['chmod'+'Sync']) to evade static detection. A sibling module lib/t

Which versions of boxy-bus-providers are malicious?

The following npm versions of boxy-bus-providers are flagged malicious: 35.3.4. Treat any of these as compromised.

How do I remediate boxy-bus-providers if I installed it?

boxy-bus-providers establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.

I already installed boxy-bus-providers — how do I know if it already compromised me?

If boxy-bus-providers 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-bus-providers part of a known attack campaign?

Yes — boxy-bus-providers is associated with the IN-MAL-2026-015356 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-bus-providers across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for boxy-bus-providers (version 35.3.4).

Malicious package

boxy-bus-providersnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

boxy-bus-providers is a confirmed malicious npm package (MAL-2026-13031) that opens a backdoor for remote access (malicious version 35.3.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in boxy-bus-providers (npm)

MAL-2026-13031

Immediate action

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

npm uninstall boxy-bus-providers

What this malware does

On require() of the package, index.js loads compat.js which downloads a platform-specific executable from attacker-controlled Cloudflare Workers hosts (oob-worker.cf100-.workers.dev through cf103-.workers.dev) with a DNS-TXT base64 fallback from *.dl.wel1.ru, writes the payload to /tmp or %TEMP% under disguised names (.cache<hex>, dotnet_diag_<hex>.exe), chmods it 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp + ' &']) or spawn('cmd',...). C2 hostnames and dangerous API names are string-split and reassembled at runtime (e.g., ['oob-worker.cf102-baf.wor','kers.dev'].join(''), require('child_'+'process'), fs['chmod'+'Sync']) to evade static detection. A sibling module lib/telemetry.js contains an identical fetch-decode-chmod-exec chain with a base64-reassembled payload delivered over DNS, staged as a secondary/updater dropper. The declared package purpose does not require downloading and executing an unpinned remote binary from anonymous workers.dev infrastructure.

Malicious versions

1 flagged

35.3.4

Indicators of compromise (SHA-256)

e6494a00553cc1e8c7e5ffdd957d31a21a33ab34a252979d7d6d551239fc0f79

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for boxy-bus-providers (version 35.3.4).
If you installed it — respond
boxy-bus-providers establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If boxy-bus-providers 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-bus-providers on npm has been identified as a malicious package (version 35.3.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015356

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks boxy-bus-providers-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.

Malware detection Runtime egress monitoring

Explore

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