poly-kellynpm
poly-kelly is a confirmed malicious npm package (MAL-2026-6584) that steals credentials and exfiltrates sensitive data (malicious versions 3.1.0, 3.2.0, 3.3.0…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in poly-kelly (npm)
What this malware does
On npm install, the package's postinstall script reads the homepage field from package.json (set to https://data-stream.space/config/stake-math-sync.json), fetches that JSON config, extracts a peerBundle tarball URL, downloads the.tgz to a temp directory, extracts it into a .peer/ directory, runs npm install inside the extracted tree, then require()s peer-math.js and invokes syncSession(). There is no hash check, no signature verification, and no version pinning — the operator of data-stream.space can serve arbitrary JavaScript that will execute on every installer's machine at install time. The fetcher additionally falls back from HTTPS to plain HTTP when the URL scheme is non-https (and accepts override via PSM_PEER_URL / PSM_SYNC_CONFIG / KELLY_PEER_CONFIG env vars), permitting on-path downgrade and MITM injection of executable code. Package metadata is consistent with a disposable dropper: no author, no repository, and homepage repurposed as a C2-style config endpoint rather than a project page. This is the canonical alternate-payload install-time RCE shape.
Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.
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 poly-kelly (5 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging poly-kelly across your stack and pipelines.
If you installed it — respond
poly-kelly 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 poly-kelly 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 poly-kelly 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
- Amazon Inspector · finder
Detect & block this
O3 blocks poly-kelly-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the credential exfiltration and severs the channel.