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Malicious code in test-agency-assign (npm)

Type: advisorySource: OSV1 source record

--- _-= 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.

Announced Source revision 1
Original source ↗

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
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