aiohttp-libscssPyPI
Advisory published Updated
aiohttp-libscss is a confirmed malicious PyPI package (MAL-2024-9937) that steals credentials and exfiltrates sensitive data (malicious versions 0.23.0, 0.23.1, 0.23.2…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in aiohttp-libscss (PyPI)
What this malware does
Imitate legit package, when used, sends out the URL of web application using the package
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2024-08-app-url-to-telegram
Reasons (based on the campaign):
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clones-real-package
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The package contains code to exfiltrate basic data from the system, like IP or username. It has a limited risk.
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dependency-confusion
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action-hidden-in-lib-usage
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for aiohttp-libscss (6 malicious versions).
If you installed it — respond
aiohttp-libscss 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 aiohttp-libscss 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
Campaign
References
Credits
- Kamil Mańkowski (kam193)
- ReversingLabs · finder
Detect & block this
O3 blocks aiohttp-libscss-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.