MAL-2026-12489

Dashboard / Malicious Package / MAL-2026-12489

MAL-2026-12489

Summary: Malicious code in tui-react-tooltip (npm)

Details: Source: amazon-inspector (5fe18ff84117bb416a0069e88f29f3ce0d3544395e20168f270d73ce757fc8df) 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. Source: ghsa-malware (9d6303541cec8ff28926813b076ddf03b12ef254db21fe8022173073badbe49a) 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.

References: https://www.npmjs.com/package/tui-react-tooltip/v/20.5.4, https://github.com/advisories/GHSA-m4vv-cf6m-g553