Which versions of transform-jsbi-to-bigint are malicious?

The following npm versions of transform-jsbi-to-bigint are flagged malicious: 9.9.0. Treat any of these as compromised.

How do I remediate transform-jsbi-to-bigint if I installed it?

transform-jsbi-to-bigint is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.

I already installed transform-jsbi-to-bigint — how do I know if it already compromised me?

If transform-jsbi-to-bigint was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.

Is transform-jsbi-to-bigint part of a known attack campaign?

Yes — transform-jsbi-to-bigint is associated with the GHSA-cg5f-wc33-48fx 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 transform-jsbi-to-bigint across my projects, lockfiles, and CI pipelines?

Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for transform-jsbi-to-bigint (version 9.9.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging transform-jsbi-to-bigint across your stack and pipelines.

Malicious package

transform-jsbi-to-bigintnpm

Malicious code in transform-jsbi-to-bigint (npm) Remove it immediately and rotate any exposed credentials.

MAL-2026-1504

Immediate action

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

npm uninstall transform-jsbi-to-bigint

What this malware does

The package 'transform-jsbi-to-bigint' is part of the PhantomRaven supply chain attack campaign (Wave 2). It uses a Remote Dynamic Dependency (RDD) technique: the published package appears benign but includes a URL-based dependency in package.json pointing to an attacker-controlled C2 server (npm.jpartifacts.com). During npm install, npm automatically fetches a malicious tarball from the C2. The tarball preinstall hook executes a 259-line payload that harvests developer emails from .gitconfig, .npmrc, and environment variables; collects CI/CD tokens from GitHub Actions, GitLab CI, Jenkins, and CircleCI; fingerprints the host system; and exfiltrates all data to http://npm.jpartifacts.com/jpd.php via redundant HTTP GET, POST, and WebSocket channels with no visible terminal output. The campaign was first disclosed by Koi Security in October 2025 (Wave 1) and extended across Waves 2-4 between November 2025 and February 2026. Full analysis: https://www.endorlabs.com/learn/return-of-phantomraven

Any developer or CI/CD system that installed this package should be considered compromised. All secrets, tokens, and credentials accessible from that environment should be rotated immediately from a separate, unaffected machine.

The package transform-jsbi-to-bigint was found to contain malicious code.

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Malicious versions

1 flagged

9.9.0

Indicators of compromise (SHA-256)

b232ed98cd416e4e354658c6cd6bb062b0fe412220cfb3fab041bdbee5f13f7a

b4fd36a3d3eec8153c5efa4d8caa1f84606d9f30c43562013cf88d40f057cc16

Detection & response playbook

Credential / info stealer

Find it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for transform-jsbi-to-bigint (version 9.9.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging transform-jsbi-to-bigint across your stack and pipelines.
If you installed it — respond
transform-jsbi-to-bigint is built to steal secrets, so assume every credential the build or runtime could read is compromised. Remove it from your project and lockfile, then rotate ALL exposed secrets — npm/registry tokens, cloud keys, CI/CD secrets, SSH keys, and any .env values — from a known-clean machine. Audit logs for unauthorized use of those credentials.
Did it already run?
If transform-jsbi-to-bigint was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks transform-jsbi-to-bigint before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.

Frequently asked questions

No. transform-jsbi-to-bigint on npm has been identified as a malicious package (version 9.9.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

GHSA-cg5f-wc33-48fx

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks transform-jsbi-to-bigint-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.

Malware detection Runtime egress monitoring