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Malicious package

devplatform-api-v1-resourcesnpm

Advisory published Updated

devplatform-api-v1-resources is a confirmed malicious npm package (MAL-2026-13543) that opens a backdoor for remote access (malicious version 35.4.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-api-v1-resources (npm)

MAL-2026-13543
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-api-v1-resources

What this malware does

On require of the package's main entry, setup.js fetches a platform-specific binary from Cloudflare Workers hosts whose names are reassembled at runtime from fragment arrays (e.g. oob-worker.cf101-*.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT fallback under *.dl.wel1.ru. The fetched bytes are written to /var/tmp or the Windows TEMP directory under disguised names (dotnet_diag_<hex>.exe,.cache_<hex>), chmod'd to 0755, and spawned detached via /bin/sh on POSIX or cmd on Windows. No hash or signature verification is performed. A second copy of the same download-write-chmod-spawn pattern, using base64 chunk assembly and string-concatenated API names (fs["chmod"+"Sync"]), is shipped in lib/telemetry.js under the guise of a telemetry SDK. C2 hostnames are split into small fragments and joined at runtime to defeat static analysis, and endpoints rotate across multiple workers.dev subdomains with a.ru DNS fallback.

Malicious versions

1 flagged
35.4.7

Indicators of compromise (SHA-256)

58312f0f83e88c3dbd6f62bc334db255d0e3d5c6aed0d8d859dd0b17ce77557c

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for devplatform-api-v1-resources (version 35.4.7).

  2. If you installed it — respond

    devplatform-api-v1-resources 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 devplatform-api-v1-resources 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. devplatform-api-v1-resources on npm has been identified as a malicious package (version 35.4.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-016993

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-api-v1-resources-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

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devplatform-api-v1-resources (npm) malicious package — MAL-2026-13543 | O3 Security