Which versions of checkout-promocode-logic are malicious?

The following npm versions of checkout-promocode-logic are flagged malicious: 35.7.7. Treat any of these as compromised.

How do I remediate checkout-promocode-logic if I installed it?

Remove checkout-promocode-logic 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.

I already installed checkout-promocode-logic — how do I know if it already compromised me?

If checkout-promocode-logic 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.

Is checkout-promocode-logic part of a known attack campaign?

Yes — checkout-promocode-logic is associated with the IN-MAL-2026-015179 campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find checkout-promocode-logic across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for checkout-promocode-logic (version 35.7.7).

Malicious package

checkout-promocode-logicnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

checkout-promocode-logic is a confirmed malicious npm package (MAL-2026-12588) that executes malicious code on install (malicious version 35.7.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in checkout-promocode-logic (npm)

MAL-2026-12588

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

npm uninstall checkout-promocode-logic

What this malware does

On require, index.js loads ext.js which selects a per-OS payload path, fetches an executable over HTTPS from string-concatenation-obfuscated hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS-TXT covert-channel fallback that reassembles base64 chunks from TXT records under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, writes the bytes to /var/tmp/.cache<rand> (or %TEMP%\dotnet_diag_<rand>.exe on Windows), chmods 0755, and spawns the file detached via /bin/sh -c or cmd.exe /c start /b. Destination hosts, DNS fallback zones, the child_process module name, and dropped file names are all assembled from split string fragments at runtime, and the dropped file is named to masquerade as a.NET diagnostic or telemetry artifact. lib/telemetry.js ships the same dropper primitives with stronger evasion (require("child_" + "process"), fs["chmod" + "Sync"], base64-chunk reassembly).

Malicious versions

1 flagged

35.7.7

Indicators of compromise (SHA-256)

c1d75e7966f60937203bdc9f6ee1a90e58fbf046f76ec5aa0b4d68018fce4f87

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for checkout-promocode-logic (version 35.7.7).
If you installed it — respond
Remove checkout-promocode-logic 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.
Did it already run?
If checkout-promocode-logic 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-promocode-logic on npm has been identified as a malicious package (version 35.7.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015179

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks checkout-promocode-logic-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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