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Malicious package

supersignaturenaturenpm

Advisory published Updated

supersignaturenature is a confirmed malicious npm package (MAL-2026-15560) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.5, 1.0.6). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in supersignaturenature (npm)

MAL-2026-15560
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
npm uninstall supersignaturenature

What this malware does

The published dist/ bundles (main/module/browser entrypoints) contain code absent from the src/ tree: at library load they read an encrypted rsaToken from a package file via readRSAFromPackage(), DES-decrypt it using a key imported from the dependency manager-thedate, and pipe the plaintext into child_process.spawn('node', [],...) via stdin, executing the decrypted JavaScript in the installer's Node process. The DES key dependency is declared as "manager-thedate": "latest" in package.json, so the effective payload can be changed at any time by whoever controls that dependency, even though supersignaturenature itself is version-pinned. The src/ tree implements a straightforward Theta blockchain client with no fs, child_process, DES, or spawn usage; the shipped dist/*.js contains var child_process = require('child_process'), function decryptToken(token, password) using CryptoJS.DES.decrypt, readRSAFromPackage, and rsa_exec.stdin.write(String(rsaDecrypted)) against a spawned node process. The runtime code is not a rollup of the shipped source, so review of src/ does not reveal the loader that consumers actually execute.

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

2 flagged
1.0.51.0.6

Indicators of compromise (SHA-256)

16a45a7d4dd29a1780c37baa5b8508bea099660b71193d6b6a30ef02edaf37ca
ab1df02839294b29ff278b7a80505be50de75eb0f317f4bf29635236a75e4b15
5004322b8287b46b1d08bb827df71af4a4f723d8a4b88c25beca9f7709d5e7d2

Detection & response playbook

Credential / info stealer
  1. Find it

    Search your lockfiles and build artifacts for supersignaturenature (2 malicious versions).

  2. If you installed it — respond

    supersignaturenature 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 supersignaturenature 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. supersignaturenature on npm has been identified as a malicious package (versions 1.0.5, 1.0.6 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-019144IN-MAL-2026-019146GHSA-x67q-xvcf-f2rw

References

Credits

  • Amazon Inspector · finder

Detect & block this

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

Explore

supersignaturenature (npm) malicious package — MAL-2026-15560 | O3 Security