Which versions of transform-regexp-constructors are malicious?

The following npm versions of transform-regexp-constructors are flagged malicious: 0.4.3. Treat any of these as compromised.

How do I remediate transform-regexp-constructors if I installed it?

transform-regexp-constructors 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-regexp-constructors — how do I know if it already compromised me?

If transform-regexp-constructors 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.

How do I find transform-regexp-constructors across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for transform-regexp-constructors (version 0.4.3).

Malicious package

transform-regexp-constructorsnpm

Advisory published Mar 16, 2026Updated Apr 30, 2026

transform-regexp-constructors is a confirmed malicious npm package (MAL-2026-3125) that steals credentials and exfiltrates sensitive data (malicious version 0.4.3). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in transform-regexp-constructors (npm)

MAL-2026-3125

Immediate action

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

npm uninstall transform-regexp-constructors

What this malware does

The package 'transform-regexp-constructors' is part of the PhantomRaven supply chain attack campaign (Wave 3). 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 (package.storeartifacts.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://package.storeartifacts.com/npm.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-regexp-constructors was found to contain malicious code.

Malicious versions

1 flagged

0.4.3

Indicators of compromise (SHA-256)

fe9ae291eb7b64a00eab5a184806e56e7451b7b0d7cad6ef42a2f22f6ec8070d

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for transform-regexp-constructors (version 0.4.3).
If you installed it — respond
transform-regexp-constructors 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-regexp-constructors 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. transform-regexp-constructors on npm has been identified as a malicious package (version 0.4.3 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

References

Credits

Amazon Inspector · finder

Detect & block this

O3 blocks transform-regexp-constructors-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

Explore

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