Which versions of mrbios are malicious?

The following PyPI versions of mrbios are flagged malicious: 0.1.1, 0.1.2. Treat any of these as compromised.

How do I remediate mrbios if I installed it?

Remove mrbios from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound network activity or persistence. Use O3 Security's dependency scanner to confirm the package and its artifacts are fully purged across your stack.

Is mrbios part of a known attack campaign?

Yes — mrbios is associated with the 2026-06-compr-woodpecker campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

Can O3 Security detect mrbios in my codebase?

Yes. O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, blocking mrbios and packages like it before any post-install script runs.

Malicious package

mrbiosPyPI

Malicious code in mrbios (PyPI) Remove it immediately and rotate any exposed credentials.

MAL-2026-5282

Immediate action

Remove the package, then rotate any secrets the build/runtime could reach.

pip uninstall mrbios

What this malware does

Versions 0.1.1, 0.1.2 were compromised.

Compromised packages start an obfuscated infostealer. The infostealer is a heavily obfuscated JavaScript code executed using Bun runtime on Python startup. It collectes all kinds of sensitive data, including API keys, credentials to package repositories, cryptocurrency assets, password manager data. Infostealer actively queries online services to collect additional secrets as well as attempts to gain persistence and spread further by publishing infected packages using collected credentials. Data are exfiltrated likely using Github. The code seems to threaten to wipe the user's data if it detects invalid GitHub tokens. Cleanup should be done with caution.

It seems to be related to the recent Mini Shai Hulud campaign.

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

Campaign: 2026-06-compr-woodpecker

Reasons (based on the campaign):

compromised-package
exfiltration-env-variables
exfiltration-cloud-tokens
exfiltration-credentials
abuses-pth
obfuscation
infostealer
The package contains code to detect if it is running in a sandbox environment.
exfiltration-crypto
files-exfiltration
destructive-actions

Malicious versions

2 flagged

0.1.10.1.2

Indicators of compromise (SHA-256)

3bc0ad232af6f3dafcf2d02441531485e0b459c2659542375c62f4f7003c9e08

046c822ab1c4c0f6cc1192cb38fe49c16aa7044dc4b06eb6272087bcfe716019

f5d5f4158dd95dcc1ccbd12390ba2fd3d323319f48a653b088008f8d27d6febf

e9144071d7cdac22d13cb876dee11f000d73d11e1767a5aa6c0a6b3a87c369b6

Frequently asked questions

No. mrbios on PyPI has been identified as a malicious package (versions 0.1.1, 0.1.2 flagged). It should be removed immediately — do not install or keep it in your dependency tree.

Campaign

2026-06-compr-woodpecker

References

Credits

Kamil Mańkowski (kam193) · reporter

Scan your dependencies

O3 Security blocks malicious packages like this at install time and in CI.

Supply-chain protection