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Malicious package

checkout-create-draft-agreement-amnpm

Advisory published Updated

checkout-create-draft-agreement-am is a confirmed malicious npm package (MAL-2026-12551) that executes malicious code on install (malicious version 35.1.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in checkout-create-draft-agreement-am (npm)

MAL-2026-12551
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall checkout-create-draft-agreement-am

What this malware does

On require of checkout-create-draft-agreement-am, index.js loads polyfill.js which downloads a platform-specific native binary from Cloudflare Workers hosts whose names are assembled by joining split character arrays (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT covert fallback channel on *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru) that retrieves base64-chunked payloads via c.<domain> and i.<domain> TXT queries. The fetched bytes are written to /var/tmp/.cache<uid> (or Temp\dotnet_diag_<uid>.exe on Windows), chmod 0755, and spawned detached via child_process.spawn("/bin/sh" or "cmd"). No hash or signature verification is performed, hosts are unrelated to the package's declared 'checkout draft agreement' purpose, and the TTL marker is disguised as 'analytics_state' with a self-labeled telemetry opt-out as cover.

Malicious versions

1 flagged
35.1.1

Indicators of compromise (SHA-256)

10d5b346e136a72594ca30d1e1d508bb152b82d20d8beb1d14bf126dd78b9977

Detection & response playbook

Malicious package

  1. Find it

    Search your lockfiles and build artifacts for checkout-create-draft-agreement-am (version 35.1.1).

  2. If you installed it — respond

    Remove checkout-create-draft-agreement-am from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.

  3. Did it already run?

    If checkout-create-draft-agreement-am 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. checkout-create-draft-agreement-am on npm has been identified as a malicious package (version 35.1.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015231

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks checkout-create-draft-agreement-am-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.

Malware detection Runtime egress monitoring

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checkout-create-draft-agreement-am (npm) malicious package — MAL-2026-12551 | O3 Security