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Malicious package

hello-world-test-mh2PyPI

Advisory published Updated

hello-world-test-mh2 is a confirmed malicious PyPI package (MAL-2026-10907) that steals credentials and exfiltrates sensitive data (malicious version 0.0.1). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in hello-world-test-mh2 (PyPI)

MAL-2026-10907
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall hello-world-test-mh2

What this malware does

setup.py decodes a base64 string and passes the result to exec() at install time. The decoded payload is a single print() statement that emits a benign string. A sibling _exfiltrate() function imports socket and urllib.request but the imported modules are never invoked; the function only prints the local platform name. There is no outbound network I/O, no reads of installer secrets or environment variables, no filesystem persistence beyond what pip itself performs, and no follow-on code execution. The package presents itself as a scanner-test artifact and behaves accordingly. The use of exec() on a base64 blob is poor practice (it matches the shape of install-time droppers and will trip pattern-based scanners), but the decoded content here is inert and confers no benefit to the publisher.

Malicious versions

1 flagged
0.0.1

Indicators of compromise (SHA-256)

621728ade22e0fd93c65e3c7ca29934f2d1cdb8cdd603fea36da803fa3688c47
68a70ea37beb115e4464b5e9ebaf58986f4cd75434257163f4ddb82f5624ea13

Detection & response playbook

Credential / info stealer
  1. Find it

    Search your lockfiles and build artifacts for hello-world-test-mh2 (version 0.0.1).

  2. If you installed it — respond

    hello-world-test-mh2 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 hello-world-test-mh2 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. hello-world-test-mh2 on PyPI has been identified as a malicious package (version 0.0.1 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

RLMA-2026-05386IN-MAL-2026-013140

References

Credits

  • Amazon Inspector · finder
  • ReversingLabs · finder

Detect & block this

O3 blocks hello-world-test-mh2-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

hello-world-test-mh2 (PyPI) malicious package — MAL-2026-10907 | O3 Security