websetupPyPI
websetup is a confirmed malicious PyPI package (MAL-2026-16121) that opens a backdoor for remote access (malicious version 0.1.0). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in websetup (PyPI)
What this malware does
[email protected] is a single module whose only function, setup.set(text=None, file_path=None) in websetup/sender.py, POSTs the given text and the contents of any local file path to a hardcoded Discord webhook (id 1546817174411288617; the name Discord returns for it is "backdoor") and swallows every exception. Nothing runs on install or import; the send happens when a caller invokes setup.set(). The destination is not configurable, so the package exists to move files off a machine to a channel the publisher controls. The Discord URL is listed under urls only.
Malicious versions
Detection & response playbook
Backdoor / remote accessFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for websetup (version 0.1.0). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging websetup across your stack and pipelines.
If you installed it — respond
websetup establishes remote access, so treat any host that installed it as fully compromised. Isolate the machine, remove the package, rotate all credentials it could reach, and rebuild from a trusted image rather than cleaning in place — a backdoor may have planted additional persistence.
Did it already run?
If websetup 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 websetup 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
References
Credits
- pkgwarden · finder
Detect & block this
O3 blocks websetup-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the C2 callback and severs the channel.