Vulnerability-Lookup

MAL-2026-16478

Vulnerability from ossf_malicious_packages

Published

2026-09-23 14:14

Modified

2026-09-23 14:14

Summary

Malicious code in event-hunter (npm)

Details

-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (f94b74862f327effaa43c1d01c4fd769626f73214d0706b80fef8b8a395cc3e8)

On npm install, the declared postinstall hook runs node index.js, which reads os.hostname() and a timestamp, base64-encodes the JSON payload, and issues an HTTPS GET to https://estimator-nemeses-unwatched.ngrok-free.dev/canary?d=<base64>. The destination is a hardcoded ngrok tunnel unrelated to any registry or vendor infrastructure, and the beacon fires automatically without any caller action or opt-in. The package's own metadata describes it as a Dependency Confusion to RCE proof-of-concept, and the install-time callback carries the installer's internal hostname to an external third party.

CWE

CWE-506 - The product contains code that appears to be malicious in nature.

Credits

Amazon Inspector inspector-research@amazon.com

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "cwes": [
          {
            "cweId": "CWE-506",
            "description": "The product contains code that appears to be malicious in nature.",
            "name": "Embedded Malicious Code"
          }
        ],
        "indicators": {
          "evidence_files": [
            {
              "path": "index.js",
              "sha256": "6ff2d04134b8ce45ad5086c9818ff39def86396d581dbef1542a7a957209406d",
              "tlsh": "9ce0c0f022e0d1a01d3037c0c252ac1fd16bf16538a552a1b7ae01d4ca4243299f3e9c"
            }
          ],
          "package_integrity": [
            {
              "filename": "event-hunter-1.0.0.tgz",
              "hashes": {
                "sha1": "83ca86d9e43cf1dc8bcdad3be7dce43ec7dcff25",
                "sha512_sri": "sha512-fOARMhsP9kCI1GjXgZPEGJg194NiSSSqzElIlKRg8RRJ6XxSdU6JLdQaUKNWradPM7YEveEAtYg8yLOTplYRcg=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "event-hunter"
      },
      "versions": [
        "1.0.0"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-020494",
        "import_time": "2026-09-23T14:19:31.953567157Z",
        "modified_time": "2026-09-23T14:14:28Z",
        "sha256": "f94b74862f327effaa43c1d01c4fd769626f73214d0706b80fef8b8a395cc3e8",
        "source": "amazon-inspector",
        "versions": [
          "1.0.0"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (f94b74862f327effaa43c1d01c4fd769626f73214d0706b80fef8b8a395cc3e8)\nOn `npm install`, the declared postinstall hook runs `node index.js`, which reads `os.hostname()` and a timestamp, base64-encodes the JSON payload, and issues an HTTPS GET to `https://estimator-nemeses-unwatched.ngrok-free.dev/canary?d=\u003cbase64\u003e`. The destination is a hardcoded ngrok tunnel unrelated to any registry or vendor infrastructure, and the beacon fires automatically without any caller action or opt-in. The package\u0027s own metadata describes it as a `Dependency Confusion to RCE` proof-of-concept, and the install-time callback carries the installer\u0027s internal hostname to an external third party.\n",
  "id": "MAL-2026-16478",
  "modified": "2026-09-23T14:14:28Z",
  "published": "2026-09-23T14:14:28Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/event-hunter/v/1.0.0"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in event-hunter (npm)"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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