Which versions of pywin-simple-gui are malicious?

The following PyPI versions of pywin-simple-gui are flagged malicious: 1.0.0. Treat any of these as compromised.

How do I remediate pywin-simple-gui if I installed it?

pywin-simple-gui 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.

I already installed pywin-simple-gui — how do I know if it already compromised me?

If pywin-simple-gui 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.

Is pywin-simple-gui part of a known attack campaign?

Yes — pywin-simple-gui is associated with the 2026-02-pywin-simple-gui campaign. Packages in the same campaign often share infrastructure and payloads, so check whether any related packages are also in your dependency tree.

How do I find pywin-simple-gui across my projects, lockfiles, and CI pipelines?

Search your lockfiles and build artifacts for pywin-simple-gui (version 1.0.0).

Malicious package

pywin-simple-guiPyPI

Advisory published Feb 17, 2026Updated Feb 17, 2026

pywin-simple-gui is a confirmed malicious PyPI package (MAL-2026-933) 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 pywin-simple-gui (PyPI)

MAL-2026-933

Immediate action

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

pip uninstall pywin-simple-gui

What this malware does

The package pretends to be a development helper but, in fact, downloads a remote executable. Dynamic analysis reveals actions like disabling Windows Defender and interest in cryptocurrencies as well as using Telegram as C2.

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

Campaign: 2026-02-pywin-simple-gui

Reasons (based on the campaign):

impersonation
Downloads and executes a remote executable.
modify-system-without-consent
crypto-related

Malicious versions

1 flagged

1.0.0

Indicators of compromise (SHA-256)

43b40c0dbbbc187822a28a401194873adc73d13e531f2789c4227374f7ec9e26

Detection & response playbook

Credential / info stealer

Find it
Search your lockfiles and build artifacts for pywin-simple-gui (version 1.0.0).
If you installed it — respond
pywin-simple-gui 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.
Did it already run?
If pywin-simple-gui 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. pywin-simple-gui on PyPI 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

2026-02-pywin-simple-gui

References

Credits

Kamil Mańkowski (kam193) · reporter

Detect & block this

O3 blocks pywin-simple-gui-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