Malicious code in nebulaai-sdk (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (dc906b81107141fbd85dcabf89fd2f5112c4e4a134045c90d6a35abb4b67d16e) The package's `preinstall.js` contains a base64+zlib-encoded 257 KB Windows PE executable. On `npm install` on Windows, the script decodes the blob and writes it to `%LOCALAPPDATA%\Microsoft\Conhost\conhost.exe` — a path and filename that impersonates a legitimate Windows console host binary — then spawns it via `child_process.spawn` with `detached: true`, `stdio: 'ignore'`, and `windowsHide: true`, so execution is silent and survives the npm process. The decoded PE contains a section named `.kntrat` and references the external host `65.87.7.132` and the repository `github.com/syskiel/kntrat-e`, indicating remote command-and-control functionality (RAT-shaped naming). The package has no legitimate SDK functionality visible; the preinstall hook exists solely to stage and run the embedded executable. Installing this package on a Windows host results in full arbitrary code execution under the installing user, with a masqueraded persistent binary staged under LOCALAPPDATA and a C2 endpoint reachable at 65.87.7.132.
MAL-2026-17228
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: osv:MAL-2026-17228
nebulaai-sdk
Source reference: /affected/0/package/name
- Affected versions
- 1.0.0
Source reference:
/affected/0/versions - Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"package": {
"name": "nebulaai-sdk",
"purl": "pkg:npm/nebulaai-sdk",
"ecosystem": "npm"
},
"versions": [
"1.0.0"
],
"database_specific": {
"cwes": [
{
"name": "Embedded Malicious Code",
"cweId": "CWE-506",
"description": "The product contains code that appears to be malicious in nature."
}
],
"source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/nebulaai-sdk/MAL-2026-17228.json",
"indicators": {
"evidence_files": [
{
"path": "preinstall.js",
"tlsh": "24e312267c5990351b18a613f83217257b336259152cd9363b3a08c709fad98cf7bebb",
"sha256": "8bc90df9b387849338d9c61a8d379cfbb0d70ea576c0e37e1fb07ba164921807"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "cf2ae5e39d71c8bf56d60ed9a2ae29d98e6c6300",
"sha512_sri": "sha512-OAc2iuXWbZebjdNGXjzg4D4Dhvo6bdXkd19VrGXxNR/c97vcO5YeOo97/UrlYETKlhY/DwsAaTWWmxNIuVbaqA=="
},
"filename": "nebulaai-sdk-1.0.0.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #23574 · Revision 1
- Added to Heist Feed
- Publisher date