pymem-winPyPI
pymem-win is a confirmed malicious PyPI package (MAL-2026-16128) that steals credentials and exfiltrates sensitive data (malicious versions 1.14.0, 1.14.1, 1.14.4…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in pymem-win (PyPI)
What this malware does
During import, the obfuscated code downloads and executes an executable. The remote executable did not exist during analysis, but the repository used to host it overlaps with previous campaign 2026-07-yt-api-dlp
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-09-pymem-win
Reasons (based on the campaign):
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obfuscation
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Downloads and executes a remote executable.
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clones-real-package
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for pymem-win (5 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging pymem-win across your stack and pipelines.
If you installed it — respond
pymem-win 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 pymem-win was ever installed, its post-install/runtime payload may have already executed. O3's L7 egress monitoring and runtime eBPF sensors detect the credential exfiltration or command-and-control callback after install and block the malicious outbound channel, so you catch and contain the actual compromise — not just the presence of the package.
How O3 protects you
O3 blocks pymem-win before install through its supply-chain scanner, and if it has already run, detects and severs the exfiltration or C2 callback at runtime through L7 egress monitoring and eBPF.
Frequently asked questions
Campaign
References
Credits
- Kamil Mańkowski (kam193) · reporter
Detect & block this
O3 blocks pymem-win-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.