Malicious code in test-agency-assign (npm)
--- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (e650e815b4409c3c07cdab7c953ed69b8052f32a28c3686397ab362bb1bd4552) test-agency-assign@1.0.4 declares a package.json postinstall script `wscript.exe Kelimasow.exe` that auto-executes a bundled 8.4 MB Go-compiled Windows PE (Kelimasow.exe, sha256 875c7641dc980538f3c3d8b344d173f97cf64a5d97dcf88d8e2932c83b876b92) on `npm install`. The package has no README, empty description and author fields, no source code, and no other functional content — the manifest is a thin wrapper whose sole install-time effect is to execute an opaque native binary on the installer's machine. Opaque binary + lifecycle-hook auto-execution + missing metadata is the canonical install-time RCE / dropper packaging shape, giving whoever published this arbitrary code execution on any Windows host that installs the package.
MAL-2026-17295
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-2026-17295
test-agency-assign
Source reference: /affected/0/package/name
- Affected versions
- 1.0.4
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": "test-agency-assign",
"purl": "pkg:npm/test-agency-assign",
"ecosystem": "npm"
},
"versions": [
"1.0.4"
],
"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/test-agency-assign/MAL-2026-17295.json",
"indicators": {
"evidence_files": [
{
"path": "package.json",
"tlsh": "e9d0a7274c55997325f4475459369406f512cf1f50755c4bb1f3641c95e3ab24889b07",
"sha256": "577410aef0b64584a96e22a53957026db6fd986dce8e35ec41413e61702260f7"
},
{
"path": "Kelimasow.exe",
"tlsh": "6286f727228414dcc58bc37245f16d7917b33caa1532b79b4ed8bea42f02796af35b48",
"sha256": "875c7641dc980538f3c3d8b344d173f97cf64a5d97dcf88d8e2932c83b876b92"
}
],
"package_integrity": [
{
"hashes": {
"sha1": "8ca5d37721d6e36333bf0f6ff2867e47a7d88a94",
"sha512_sri": "sha512-bor5lCiYmZldV4snptBpNPvRVr2KrEj5YVQWQvjkOdiH8h5vwzGyKpQ8TbBQ/yKBgppT+HYuetWOaeER/ENDhA=="
},
"filename": "test-agency-assign-1.0.4.tgz"
}
]
}
}
}
]Publisher severity
No explicit severity was provided.
- Event
- #32234 · Revision 1
- Added to Heist Feed
- Publisher date