Malicious code in checkmate-remediation-assistant (npm)

{
  "id": "278cd22868a29d8d0a7cab344ef0b026cb87917198086d746612b45ee3f4f188",
  "url": "https://osv.dev/vulnerability/MAL-2026-17572",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in checkmate-remediation-assistant (npm)",
    "summary": "checkmate-remediation-assistant@1.0.0 contains no functional code: its only behaviour is a preinstall script that runs `node index.js` on npm install. index.js collects the install directory, the user's home directory, hostname, username and DNS servers, and the full contents of /etc/passwd and /etc/hosts, then sends them as JSON in an HTTPS POST to `9q0lp9mr6ek7nrnklhzkmbpuglmda4yt.oastify.com`, a Burp Collaborator endpoint. The npm account testneo7755 published it on 2026-10-05 and it was unpublished about two minutes later; the same account published with-cte the same day with the same index.js and a different Collaborator subdomain. --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (c8f55d0ebeea19e228ec6edbb1782df87539c476478d3935559fda90a458b1b4) The package's package.json declares a preinstall hook that runs index.js on npm install. index.js collects os.hostname(), os.userInfo(), the home directory, DNS server configuration, __dirname, the local package.json, and the contents of /etc/passwd and /etc/hosts, then transmits the collected data over HTTPS to a hardcoded Burp Collaborator (oastify.com) subdomain (9q0lp9mr6ek7nrnklhzkmbpuglmda4yt.oastify.com). The destination is an out-of-band interaction server not associated with any declared publisher or documented package purpose, and the exfiltration fires automatically on default install without user interaction.",
    "evidence": "osv:MAL-2026-17572",
    "products": [
      {
        "name": {
          "value": "checkmate-remediation-assistant",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.0",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-17572",
      "aliases": [
        "MAL-2026-17572"
      ],
      "affected": [
        {
          "package": {
            "name": "checkmate-remediation-assistant",
            "purl": "pkg:npm/checkmate-remediation-assistant",
            "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."
              },
              {
                "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/checkmate-remediation-assistant/MAL-2026-17572.json",
            "indicators": {
              "evidence_files": [
                {
                  "path": "index.js",
                  "tlsh": "5d412395a2c917330dd210c06a1c70843359fa777269a8d076cf42969f869f8b7326f3",
                  "sha256": "c3b9a6b9837af57b17acac41d279a905d70365d3d9e57284c8c217b7508d78ca"
                }
              ],
              "package_integrity": [
                {
                  "hashes": {
                    "sha1": "1116b68d5c21ed65ff06b2edc7dfad7181636bf7",
                    "sha512_sri": "sha512-Svgam2vzDqxOjZDANOlRGP+NDkxy6eyoq3NGdsJt2sUH+9YYxgnL8cxwM5DZG6T86bcT5JUS1tbJtHIYrCIrLw=="
                  },
                  "filename": "checkmate-remediation-assistant-1.0.0.tgz"
                }
              ]
            }
          }
        }
      ],
      "modified": "2026-10-07T06:30:05.443363358Z",
      "provider": "osv",
      "references": [
        "https://www.npmjs.com/package/checkmate-remediation-assistant/v/1.0.0",
        "https://www.npmjs.com/package/checkmate-remediation-assistant"
      ],
      "provider_metadata": {
        "iocs": {
          "urls": [
            "https://9q0lp9mr6ek7nrnklhzkmbpuglmda4yt.oastify.com/"
          ],
          "files": [
            {
              "note": "preinstall script runs `node index.js`.",
              "paths": [
                "package.json"
              ],
              "source": "PACKAGE_ARCHIVE",
              "digests": {
                "sha256": "2a7881b42271bb9aa87855e0af958857c1b6acaa670150481baef0847dd78f43"
              }
            },
            {
              "note": "Executed by the preinstall script of checkmate-remediation-assistant@1.0.0.",
              "paths": [
                "index.js"
              ],
              "source": "PACKAGE_ARCHIVE",
              "digests": {
                "sha256": "c3b9a6b9837af57b17acac41d279a905d70365d3d9e57284c8c217b7508d78ca"
              }
            }
          ],
          "domains": [
            "9q0lp9mr6ek7nrnklhzkmbpuglmda4yt.oastify.com"
          ]
        },
        "malicious-packages-origins": [
          {
            "id": "IN-MAL-2026-021081",
            "sha256": "c8f55d0ebeea19e228ec6edbb1782df87539c476478d3935559fda90a458b1b4",
            "source": "amazon-inspector",
            "versions": [
              "1.0.0"
            ],
            "import_time": "2026-10-05T16:22:57.119740865Z",
            "modified_time": "2026-10-05T16:15:03Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 93161,
  "published_at": "2026-10-05T09:02:39+00:00"
}