Malicious code in chalk-figlet (npm)

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (66dfb43d5f4ae643e32497447293c12170a21f258a7e7d3d07e8f90f2119e13b) package.json declares a postinstall script (`node example.js`) that requires index.js at install time. index.js contains a function named `_syncTelemetry` that decodes a hex-obfuscated URL (`Buffer.from('687474703a...','hex')` -> `http://104.234.65.75:700/setup.exe`) and a hex-obfuscated filename (`RuntimeBroker.exe`), downloads the binary over plain HTTP from a bare IP using `axios.get(..., {responseType:'stream'})` piped to `fs.createWriteStream` in `os.tmpdir()`, and executes it via `child_process.exec` with `windowsHide: true`. Execution is gated on `process.env.npm_lifecycle_event` so it fires during `npm install`. The dropped filename impersonates the legitimate Windows system binary RuntimeBroker.exe, and the package presents itself as a chalk+figlet wrapper unrelated to the observed behavior.

Source published

28 Sep 2026 18:07:46 UTC

Source modified

28 Sep 2026 18:30:06 UTC

Observed here

24 Oct 2026 13:17:17 UTC

Source terms

OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.