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Malicious package

twork-data-services-product-design-datanpm

Advisory published Updated

twork-data-services-product-design-data is a confirmed malicious npm package (MAL-2026-12296) that opens a backdoor for remote access (malicious version 20.1.5). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in twork-data-services-product-design-data (npm)

MAL-2026-12296
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall twork-data-services-product-design-data

What this malware does

On require of the package's main module, loader.js downloads a platform-specific binary from a set of obfuscated Cloudflare Workers subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev) — reconstructed at runtime from split string arrays — with a DNS TXT chunked-base64 fallback over *.dl.well1.site (tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site). The fetched bytes are written to /var/tmp or %TEMP% under cover names such as.cache<hex> and dotnet_diag_<hex>.exe, chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. A parallel dropper implementation is bundled at lib/telemetry.js dressed as an APM/telemetry SDK, using base64 chunk assembly (Buffer.from(chunks,'base64')), string-concatenated fs['chmod'+'Sync'] to set 0755, and cp.spawn('/bin/sh', ['-c', filePath+' &']). The string-split concealment of C2 hostnames, DNS exfil domains, and the child_process module name is deliberate static-analysis evasion.

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

1 flagged
20.1.5

Indicators of compromise (SHA-256)

1a86edfca41ff32a7b044ecb921977944dbdc5cf5d2a3ccae4e5ca001a851816
2d6e86c90eaa21bd4c4f13544a862940ad6abab638be66015cfb227b9a178c4d

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for twork-data-services-product-design-data (version 20.1.5).

  2. If you installed it — respond

    twork-data-services-product-design-data 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.

  3. Did it already run?

    If twork-data-services-product-design-data 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. twork-data-services-product-design-data on npm has been identified as a malicious package (version 20.1.5 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-014605GHSA-hw9w-9435-w32f

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks twork-data-services-product-design-data-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

All malware advisories How O3 detects malware Vulnerability database
twork-data-services-product-design-data (npm) malicious package — MAL-2026-12296 | O3 Security