codeoptimizerPyPI
Malicious code in codeoptimizer (PyPI) Remove it immediately and rotate any exposed credentials.
What this malware does
On importing the module, there is an automated start of a Telegram bot capable of exfiltrating passwords from browsers, executing arbitrary commands and so on. While the description states it's a monitoring tool, the automated start, capabilities targeting secret values suggest malicious intentions.
Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers.
Campaign: 2025-03-yolov8mini
Reasons (based on the campaign):
-
infostealer
-
exfiltration-generic
-
dependency-confusion
-
exfiltration-browser-data
-
The package contains code to execute remote commands (probably limited to a specific set) on the victim's machine.
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 codeoptimizer (2 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging codeoptimizer across your stack and pipelines.
If you installed it — respond
codeoptimizer 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 codeoptimizer 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 codeoptimizer 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)
- ReversingLabs · finder
Detect & block this
O3 blocks codeoptimizer-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.