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Malicious package

devplatform-api-v2-endpointnpm

Advisory published Updated

devplatform-api-v2-endpoint is a confirmed malicious npm package (MAL-2026-12694) that opens a backdoor for remote access (malicious version 35.6.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in devplatform-api-v2-endpoint (npm)

MAL-2026-12694
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-api-v2-endpoint

What this malware does

On require(), index.js loads./vendor, whose top-level init() fetches a platform-specific native binary from runtime-assembled Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev), with a fallback that reassembles a base64-encoded binary from DNS TXT records under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The retrieved bytes are written to /var/tmp or %TEMP% under cover-story names such as.cache<rand> and dotnet_diag_<rand>.exe, chmod 0755, and detached-spawned via /bin/sh -c or cmd.exe /c start /b. C2 hostnames are constructed by joining split string fragments to evade static scanners, and the package labels the activity as 'analytics'/'telemetry'. The result is arbitrary attacker-controlled code execution on the installer's host on every import of the package.

Malicious versions

1 flagged
35.6.7

Indicators of compromise (SHA-256)

6f78874e3ff64b85f64b75f0481a7cadc00f15dea7b4f0eb85c1728a65ee2020

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for devplatform-api-v2-endpoint (version 35.6.7).

  2. If you installed it — respond

    devplatform-api-v2-endpoint 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-v2-endpoint 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-v2-endpoint on npm has been identified as a malicious package (version 35.6.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015081

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-api-v2-endpoint-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-v2-endpoint (npm) malicious package — MAL-2026-12694 | O3 Security