Which versions of bigops-create-manifest are malicious?

The following npm versions of bigops-create-manifest are flagged malicious: 35.2.4. Treat any of these as compromised.

How do I remediate bigops-create-manifest if I installed it?

bigops-create-manifest 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.

I already installed bigops-create-manifest — how do I know if it already compromised me?

If bigops-create-manifest 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 bigops-create-manifest part of a known attack campaign?

Yes — bigops-create-manifest is associated with the IN-MAL-2026-011505 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 bigops-create-manifest across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for bigops-create-manifest (version 35.2.4).

Malicious package

bigops-create-manifestnpm

Advisory published Aug 5, 2026Updated Aug 5, 2026

bigops-create-manifest is a confirmed malicious npm package (MAL-2026-12037) that opens a backdoor for remote access (malicious version 35.2.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in bigops-create-manifest (npm)

MAL-2026-12037

Immediate action

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

npm uninstall bigops-create-manifest

What this malware does

On require, index.js loads polyfill.js which selects a platform-specific endpoint, downloads an opaque native binary over HTTPS from one of several Cloudflare Workers hosts (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS TXT covert-channel fallback that reads base64-encoded chunks from sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru. The fetched bytes are written to a randomized filename disguised as dotnet_diag<hex>.exe on Windows or.cache_<hex> under /var/tmp on Unix, chmod 0755, and spawned detached via /bin/sh -c or cmd. C2 hostnames and resolver domains are assembled at runtime via split-string array joins; artifact naming, an analytics_state marker, and DISABLE_TELEMETRY env checks frame the operation as diagnostics. The package's advertised purpose (a manifest wrapper) has no need for downloading and executing a native binary from third-party infrastructure.

Malicious versions

1 flagged

35.2.4

Indicators of compromise (SHA-256)

027d25851cc38da61b10c0ce1d722d3e8455826d2f7866474432e98dd8f1b806

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for bigops-create-manifest (version 35.2.4).
If you installed it — respond
bigops-create-manifest 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.
Did it already run?
If bigops-create-manifest 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. bigops-create-manifest on npm has been identified as a malicious package (version 35.2.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-011505

References

npmjs.com

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks bigops-create-manifest-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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