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Malicious package

devplatform-api-v1-endpointnpm

Advisory published Updated

devplatform-api-v1-endpoint is a confirmed malicious npm package (MAL-2026-12693) that opens a backdoor for remote access (malicious version 35.9.8). Do not install it — remove it immediately and rotate any exposed credentials.

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

MAL-2026-12693
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall devplatform-api-v1-endpoint

What this malware does

On require, adapter.js selects a platform-specific asset path and fetches an executable from string-split-obfuscated hosts under oob-worker.cf10*-*.workers.dev, falling back to base64-encoded payload chunks reassembled from DNS TXT queries against *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). The fetched bytes are written to /var/tmp or %TEMP% under cover-story filenames (.cache<hex>, dotnet_diag_<hex>.exe), chmod 0755, and spawned detached via /bin/sh -c or cmd /c start /b, with no hash or signature verification. A persistence marker (.analytics_state) with a ~6.4h freshness window throttles repeat activity. The delivery mechanism has no relation to the package's advertised SDK purpose, and the C2 host strings are reconstructed at runtime from split fragments via.join('') to defeat static analysis.

Malicious versions

1 flagged
35.9.8

Indicators of compromise (SHA-256)

f2ed0defa1fbae571985664baae47d89d796f943b249115eb73a38edce04fb6c

Detection & response playbook

Backdoor / remote access

  1. Find it

    Search your lockfiles and build artifacts for devplatform-api-v1-endpoint (version 35.9.8).

  2. If you installed it — respond

    devplatform-api-v1-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-v1-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-v1-endpoint on npm has been identified as a malicious package (version 35.9.8 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015080

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks devplatform-api-v1-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

Explore

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devplatform-api-v1-endpoint (npm) malicious package — MAL-2026-12693 | O3 Security