tui-react-tooltipnpm
tui-react-tooltip is a confirmed malicious npm package (MAL-2026-12489) that executes malicious code on install (malicious version 20.5.4). Do not install it — remove it immediately and rotate any exposed credentials.
Malicious code in tui-react-tooltip (npm)
What this malware does
The package advertises itself as a React tooltip UI component, but index.js (declared main) unconditionally requires _loader.js, which on module load downloads a platform-specific binary from hardcoded hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS-TXT fallback to tin.dl.well1.site / tina.dl.well1.site / ldr.dl.well1.site / win.dl.well1.site, writes it to /tmp or %TEMP% under disguised names (.cache_<rnd>, dotnet_diag_<rnd>.exe), chmods it 0755 on POSIX, and spawns it detached via /bin/sh -c or cmd.exe start /b. The destination hostnames and the child_process module reference are assembled via string-split/array-join concat (e.g. ["oob","-worker.cf103-070.","workers.de","v"].join("")) to evade static string scanners. A TTL marker in the temp directory suppresses re-execution. Sibling file lib/telemetry.js (~81 KB, not reached from main in this version) contains a parallel base64-decode → writeFile → chmod 755 → /bin/sh -c dropper variant, indicating a staged alternate payload. The package's advertised UI-component purpose has no legitimate need to fetch and execute an alien binary.
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
Scan your lockfiles (package-lock.json, pnpm-lock.yaml, yarn.lock, requirements.txt, poetry.lock, etc.) and build artifacts for tui-react-tooltip (version 20.5.4). O3 Security's supply-chain scanner checks every dependency against known-malicious package intelligence at install time and in CI, flagging tui-react-tooltip across your stack and pipelines.
If you installed it — respond
Remove tui-react-tooltip 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 tui-react-tooltip 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 tui-react-tooltip 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 tui-react-tooltip-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.