Which versions of chai-use-chains are malicious?

The following npm versions of chai-use-chains are flagged malicious: 1.2.6, 1.2.7. Treat any of these as compromised.

How do I remediate chai-use-chains if I installed it?

chai-use-chains 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 chai-use-chains — how do I know if it already compromised me?

If chai-use-chains 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 chai-use-chains part of a known attack campaign?

Yes — chai-use-chains is associated with the RLMA-2026-05013, RLUA-2026-06144 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 chai-use-chains across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for chai-use-chains (2 malicious versions).

Malicious package

chai-use-chainsnpm

Advisory published Apr 15, 2026Updated Sep 1, 2026

chai-use-chains is a confirmed malicious npm package (MAL-2026-2899) that opens a backdoor for remote access (malicious versions 1.2.6, 1.2.7). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in chai-use-chains (npm)

MAL-2026-2899

Immediate action

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

npm uninstall chai-use-chains

What this malware does

chai-use-chains is a malicious npm package that when imported downloads a C2 dropper from https://jsonkeeper[.]com/b/FAWPU and executes it (similar to malware in to chai-await-test).

The package chai-use-chains was found to contain malicious code.

Malicious versions

2 flagged

1.2.61.2.7

Indicators of compromise (SHA-256)

82cb30ff865bcb0071b1861dd09c9b8e770861b76d263b30e42aafd54626c39b

e4e561c5119981ab0a4531c0538ae3eae922ea8830a4360a7f0a4512dd09ab8b

44d63dd94f8fbdda380398116c306bf1e687dbc90792c751e8a23d399581848b

Detection & response playbook

Backdoor / remote access

Find it
Search your lockfiles and build artifacts for chai-use-chains (2 malicious versions).
If you installed it — respond
chai-use-chains 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 chai-use-chains 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. chai-use-chains on npm has been identified as a malicious package (versions 1.2.6, 1.2.7 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-05013RLUA-2026-06144

References

Credits

Amazon Inspector · finder
ReversingLabs · finder
indece · finder

Detect & block this

O3 blocks chai-use-chains-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

All malware advisories How O3 detects malware Vulnerability database