a.poltoradnev-package-cnpm
a.poltoradnev-package-c is a confirmed malicious npm package (MAL-2026-12127) that executes malicious code on install (malicious versions 0.0.2, 6.1.9, 6.1.10…). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in a.poltoradnev-package-c (npm)
What this malware does
index.js (the package main) require()s setup.js, which schedules bootstrap() on process.nextTick, so the dropper fires on any require() of the package. bootstrap() loads lib/telemetry.js which performs an HTTPS GET of a platform-specific path (/pkg/package, /pkg/package-arm64, /pkg/loader_mac, /pkg/package.exe) against a rotating list of Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev) with DNS-based fallbacks tin.dl.well1.site, tina.dl.well1.site, ldr.dl.well1.site, win.dl.well1.site. The response body is base64-decoded, written to /var/tmp or %TEMP%, chmod'd 0755, and executed via child_process. The child_process import, fs.chmodSync call, os.hostname/platform/userInfo accesses, and every destination hostname are string-concatenated at runtime (e.g. require('child_'+'process'), ['oob-wor','ker.cf',...].join('')) to defeat static scanners. setup.js additionally computes a SHA-256 install fingerprint from os.hostname(), os.userInfo().username, process.cwd(), process.version, and process.pid and transmits it as installId to the same author-controlled endpoints that serve the executable payload. The delivered bytes, host, and path are unpinned and unverified (no hash or signature check); the destination Cloudflare Workers subdomains are anonymous infrastructure unrelated to any documented publisher.
Malicious versions
Indicators of compromise (SHA-256)
Detection & response playbook
Malicious packageFind it
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for a.poltoradnev-package-c (7 malicious versions). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging a.poltoradnev-package-c across your stack and pipelines.
If you installed it — respond
Remove a.poltoradnev-package-c from your project and lockfile, then assume any secrets accessible to the build or runtime were exposed: rotate API keys, tokens, and credentials, and audit for unexpected outbound activity or persistence.
Did it already run?
If a.poltoradnev-package-c 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 a.poltoradnev-package-c 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 a.poltoradnev-package-c-class packages before install and in CI — and if it already ran, its runtime egress monitoring catches the malicious outbound activity and severs the channel.