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Malicious package

claims-claims-api-adaptersnpm

Advisory published Updated

claims-claims-api-adapters is a confirmed malicious npm package (MAL-2026-12610) that steals credentials and exfiltrates sensitive data (malicious version 35.7.9). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in claims-claims-api-adapters (npm)

MAL-2026-12610
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall claims-claims-api-adapters

What this malware does

On require, index.js loads loader.js which selects a platform-specific temp path, downloads a binary over HTTPS from anonymous *.workers.dev hosts whose names are reconstructed at runtime by joining split string fragments (e.g. oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), writes the bytes to a stealth filename (dotnet_diag<rand>.exe on Windows,.cache_<rand> on Linux/macOS), chmods 0755, and spawns it detached via /bin/sh -c or cmd. If HTTPS retrieval fails, the loader falls back to a covert DNS-TXT channel against sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, requesting c.<domain> for a chunk count and <i>.<domain> for up to 2000 base64 chunks, concatenating and base64-decoding the result into the payload buffer that is then written and executed. No hash or signature verification is performed; destination hostnames are obfuscated to evade static inspection.

Malicious versions

1 flagged
35.7.9

Indicators of compromise (SHA-256)

dbf35d865ef56cd2fa5863a636bb33bf43d7afe418e9028c3bb73af13470bf63

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for claims-claims-api-adapters (version 35.7.9).

  2. If you installed it — respond

    claims-claims-api-adapters is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

  3. Did it already run?

    If claims-claims-api-adapters 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. claims-claims-api-adapters on npm has been identified as a malicious package (version 35.7.9 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015170

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks claims-claims-api-adapters-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring

Explore

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claims-claims-api-adapters (npm) malicious package — MAL-2026-12610 | O3 Security