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Malicious package

rgx33-flex-layout-corenpm

Advisory published Updated

rgx33-flex-layout-core is a confirmed malicious npm package (MAL-2026-17521) that steals credentials and exfiltrates sensitive data (malicious version 1.0.0). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in rgx33-flex-layout-core (npm)

MAL-2026-17521
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall rgx33-flex-layout-core

What this malware does

Package name and exports (thunderboltRegistry, siteAssetsRegistry, editorRegistry, corvidRegistry, etc.) impersonate internal Wix thunderbolt registry packages, targeting Wix build pipelines via dependency confusion. On require, thunderboltRegistry.js executes id and uname -r via child_process.execSync and collects hostname, pid, Node.js version, and platform. These values are encoded into subdomains of an attacker-controlled Interactsh/OAST callback domain (davdpb8lhot13kgmnhp0863x9g83mpswq.oast.live) and also POSTed to a webhook.site collector (webhook.site/0492a36c-4d7b-408a-865c-226db25987ba). The exfiltration behavior has no relation to the package's advertised 'flexbox layout utilities' purpose, and the manifest references to static.parastorage.com paths reinforce the Wix-targeted dependency-confusion shape.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

02200327d66cf0661b787f58049b55b5fbb95dfb76fbb81a679cc71439bd85eb

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for rgx33-flex-layout-core (version 1.0.0).

  2. If you installed it — respond

    rgx33-flex-layout-core 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.

  3. Did it already run?

    If rgx33-flex-layout-core 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. rgx33-flex-layout-core on npm has been identified as a malicious package (version 1.0.0 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-020955

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks rgx33-flex-layout-core-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

All malware advisories How O3 detects malware Vulnerability database
rgx33-flex-layout-core (npm) malicious package — MAL-2026-17521 | O3 Security