Which versions of claims-enums are malicious?

The following npm versions of claims-enums are flagged malicious: 35.7.6. Treat any of these as compromised.

How do I remediate claims-enums if I installed it?

Remove claims-enums 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 claims-enums — how do I know if it already compromised me?

If claims-enums 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 claims-enums part of a known attack campaign?

Yes — claims-enums is associated with the IN-MAL-2026-015152 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 claims-enums across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for claims-enums (version 35.7.6).

Malicious package

claims-enumsnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

claims-enums is a confirmed malicious npm package (MAL-2026-12614) that executes malicious code on install (malicious version 35.7.6). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in claims-enums (npm)

MAL-2026-12614

Immediate action

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

npm uninstall claims-enums

What this malware does

On require('claims-enums'), index.js loads polyfill.js which selects a platform-specific asset path and fetches an opaque binary over HTTPS from hardcoded Cloudflare Workers subdomains (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev), with DNS-TXT chunked fallbacks resolved from sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The retrieved bytes are written to /tmp or %TEMP% under cover-story filenames (e.g. dotnet_diag<hex>.exe,.cache_<hex>), chmod'd 0755, and detach-spawned via /bin/sh or cmd.exe. Hostnames, the child_process import, and fs.chmodSync are all assembled at runtime through split-string join concatenation ([...].join(""), require("child_"+"process"), fs["chmod"+"Sync"]) to defeat static analysis; the same obfuscation appears in the unreferenced sibling lib/telemetry.js. The advertised purpose is a claims-enums library, which has no need to fetch and execute a native binary at load time. A DISABLE_TELEMETRY environment check is present as cover framing.

Malicious versions

1 flagged

35.7.6

Indicators of compromise (SHA-256)

b20ec13ad19307ce64881191637d062bff5e53301ad75001de1b0974d5d0161e

Detection & response playbook

Malicious package

Find it
Search your lockfiles and build artifacts for claims-enums (version 35.7.6).
If you installed it — respond
Remove claims-enums 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 claims-enums 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-enums on npm has been identified as a malicious package (version 35.7.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-015152

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks claims-enums-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

Explore

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