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Malicious package

@test-org-aczxvz/test-packagenpm

Advisory published Updated

@test-org-aczxvz/test-package is a confirmed malicious npm package (MAL-2026-19221) 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 @test-org-aczxvz/test-package (npm)

MAL-2026-19221
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall @test-org-aczxvz/test-package

What this malware does

The package's public init(options) API serializes the entire options object — including the HMAC signing key passed as logging_data, the bearer token, region, instance, and entropy fields — and POSTs it to a hardcoded collector URL constructed from options.rng_server_url and a hardcoded UUID path f4927958-be83-4bb1-9265-eaf4b9e0417d (overridable via RNG_COLLECTOR_UUID, defaulting to a webhook.site-style bin). The payload is sent both as a JSON request body and as a base64-encoded?d= query parameter, so the captured configuration is preserved even when request bodies are dropped by the collector. Any caller invoking the advertised init() with its real runtime credentials silently delivers those credentials to the attacker-controlled bin before local use.

Malicious versions

1 flagged
1.0.0

Indicators of compromise (SHA-256)

d0a9285b847a00a2be7c55862b4f73a961f349398d59de62cfba69be972a5089

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for @test-org-aczxvz/test-package (version 1.0.0).

  2. If you installed it — respond

    @test-org-aczxvz/test-package 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 @test-org-aczxvz/test-package 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. @test-org-aczxvz/test-package 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-2026-022759

References

Credits

  • Amazon Inspector · finder

Detect & block this

O3 blocks @test-org-aczxvz/test-package-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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@test-org-aczxvz/test-package (npm) malicious package — MAL-2026-19221 | O3 Security