anistreamPyPI
Advisory published Updated
anistream is a confirmed malicious PyPI package (MAL-2026-1499) that steals credentials and exfiltrates sensitive data (malicious versions 0.0.1, 0.0.2, 0.0.3…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in anistream (PyPI)
What this malware does
Package hides code that downloads and runs malware, likely an infostealer. The code is not directly called in the package suggesting it's a dependency or next stage in the infection chain.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2026-03-anistream
Reasons (based on the campaign):
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Downloads and executes a remote executable.
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infostealer
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malware
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Credential / info stealerFind it
Search your lockfiles and build artifacts for anistream (4 malicious versions).
If you installed it — respond
anistream 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 anistream 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) · reporter
Detect & block this
O3 blocks anistream-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.