twork-mf-e2e-nitronpm
Advisory published Updated
twork-mf-e2e-nitro is a confirmed malicious npm package (MAL-2026-12303) that executes malicious code on install (malicious version 20.8.5). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in twork-mf-e2e-nitro (npm)
What this malware does
On require of the package, index.js loads compat.js which reconstructs Cloudflare workers.dev hostnames via split-string array concatenation (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT fallback under *.dl.well1.site, downloads a platform-specific binary via https.get, writes it to /var/tmp or the Windows temp directory under a masquerading name (.cache<hex> on Unix, dotnet_diag_<hex>.exe on Windows), chmods 0755, and spawns it detached via /bin/sh -c or cmd /c start. Misleading comments referencing an 'Analytics SDK', a 'DISABLE_TELEMETRY opt-out', and a 'SHA-256 integrity check' are present in the source; no such integrity check is implemented. A second copy of the same write-chmod-spawn dropper is staged in lib/telemetry.js (81 KB), reachable via dynamic loading. The require("child_"+"process") and fs["chmod"+"Sync"] patterns further evidence deliberate string-level evasion.
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
Malicious packageFind it
Search your lockfiles and build artifacts for twork-mf-e2e-nitro (version 20.8.5).
If you installed it — respond
Remove twork-mf-e2e-nitro 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 twork-mf-e2e-nitro 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
- Amazon Inspector · finder
Detect & block this
O3 blocks twork-mf-e2e-nitro-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.