ateslassiaPyPI
Advisory published Updated
ateslassia is a confirmed malicious PyPI package (MAL-2025-6436) that steals credentials and exfiltrates sensitive data (malicious version 3.0.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in ateslassia (PyPI)
What this malware does
Generic campaign for all (likely) research / pentests, where the amount or art of collected data raises questions about the privacy, security and ethical side.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: GENERIC-questionable-pentest
Reasons (based on the campaign):
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exfiltration-env-variables
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exfiltration-generic
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The package overrides the install command in setup.py to execute malicious code during installation.
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typosquatting
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for ateslassia (version 3.0.0).
If you installed it — respond
ateslassia 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 ateslassia 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 ateslassia-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.