MAL-2026-13523
Vulnerability from ossf_malicious_packages
Published
2026-08-07 12:31
Modified
2026-08-07 12:31
Summary
Malicious code in beaver-ui-popover-marker (npm)
Details

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

Source: amazon-inspector (44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559)

On require() of the package, index.js loads _vendor.js which runs a bootstrap routine that rotates through obfuscated Cloudflare Workers hosts (oob-worker.cf.workers.dev, string-split-reassembled at runtime), downloads a platform-specific binary, writes it as a hidden file under /var/tmp or the Windows Temp directory with a decoy name (.cache_ / dotnet_diag_.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. A DNS TXT fallback under .dl.wel1.ru reassembles a base64-encoded payload when HTTPS fetches fail. A cover-story opt-out gate honors DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and caches state at /tmp/.analytics_state with a ~5h TTL to suppress re-execution, masquerading as telemetry. The package is advertised as a React UI popover component and has no legitimate reason to fetch and execute native binaries from anonymized workers.dev endpoints at import time. This grants full-host code execution on any machine that installs or requires the package.

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

{
  "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": "_vendor.js",
              "sha256": "4c543d8d78b49a389306549fef20a46ad7c2f210a285beb25d9f0633cccd9dd8",
              "tlsh": "cea1866a12aa70194bb0d7e48717441af65af6633380c6d8fb6c65941f77124c3b2efc"
            }
          ],
          "package_integrity": [
            {
              "filename": "beaver-ui-popover-marker-35.5.8.tgz",
              "hashes": {
                "sha1": "c77d6419c31c56b3fe6b6c53f58160cb8161108b",
                "sha512_sri": "sha512-fczD7A3bhGGtSoZ5ivgWMeOT+4WnzPXPHKLFkoATFnSJ7FXfyNUwrRMT40ula2gKd0VjlYTe0FE8XucSL6vMuA=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "beaver-ui-popover-marker"
      },
      "versions": [
        "35.5.8"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-017014",
        "import_time": "2026-08-07T12:51:22.205884043Z",
        "modified_time": "2026-08-07T12:31:20Z",
        "sha256": "44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559",
        "source": "amazon-inspector",
        "versions": [
          "35.5.8"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (44380c53af51645632593b0a86d93258bb71aecddc88d9ff3487a7906486e559)\nOn require() of the package, index.js loads _vendor.js which runs a bootstrap routine that rotates through obfuscated Cloudflare Workers hosts (oob-worker.cf*.workers.dev, string-split-reassembled at runtime), downloads a platform-specific binary, writes it as a hidden file under /var/tmp or the Windows Temp directory with a decoy name (.cache_\u003chex\u003e / dotnet_diag_\u003chex\u003e.exe), chmods 0755, and spawns it detached via /bin/sh or cmd. A DNS TXT fallback under *.dl.wel1.ru reassembles a base64-encoded payload when HTTPS fetches fail. A cover-story opt-out gate honors DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK and caches state at /tmp/.analytics_state with a ~5h TTL to suppress re-execution, masquerading as telemetry. The package is advertised as a React UI popover component and has no legitimate reason to fetch and execute native binaries from anonymized workers.dev endpoints at import time. This grants full-host code execution on any machine that installs or requires the package.\n",
  "id": "MAL-2026-13523",
  "modified": "2026-08-07T12:31:20Z",
  "published": "2026-08-07T12:31:20Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/beaver-ui-popover-marker/v/35.5.8"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in beaver-ui-popover-marker (npm)"
}



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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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