MAL-2026-13528
Vulnerability from ossf_malicious_packages
Published
2026-08-07 12:32
Modified
2026-08-07 12:32
Summary
Malicious code in bnpl-blocks-atom-bnpl-faq-item (npm)
Details

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

Source: amazon-inspector (bcd2fbb910548df40180cd1e71ae6234dddbd8c60b871933d9012bab9f0742bb)

The package's main entry (index.js) requires./_ext at module load. _ext.js downloads a platform-specific binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev) — assembled via string-split/join to defeat static scanners — with a DNS-TXT chunked-download fallback under .dl.wel1.ru (c. for chunk count, . for base64 payload chunks). The fetched bytes are written to /var/tmp/.cache_ on POSIX or %TEMP%\dotnet_diag_.exe on Windows, chmod 0755, and spawned detached via /bin/sh -c or cmd. A stamp file named.analytics_state and the dotnet_diag_ filename disguise are used to blend into normal system activity. Any require()/import of the package triggers download-and-execute of opaque attacker-controlled code on the installer's machine.

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": "_ext.js",
              "sha256": "7d120bd6af322356bfd075f029d297fd34f36a160e9806773882247a2f9206d2",
              "tlsh": "58a1b69a166a700987b0d7e4c6274416f65be66337c0d5d8fb9c65981f730248372efc"
            }
          ],
          "package_integrity": [
            {
              "filename": "bnpl-blocks-atom-bnpl-faq-item-35.8.2.tgz",
              "hashes": {
                "sha1": "a10c0bb6510dd7db7793f662abb1323fc1578d43",
                "sha512_sri": "sha512-JZ4VUSkTKO2b63Ptf6nBw0rPzMa5oioTbLWFVZ3jnCy8Yy8A0WyYzHRW5jPWcfo5sxqjBC3RsRgC/PmtbYoVQA=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "bnpl-blocks-atom-bnpl-faq-item"
      },
      "versions": [
        "35.8.2"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-017023",
        "import_time": "2026-08-07T12:51:22.602583377Z",
        "modified_time": "2026-08-07T12:32:37Z",
        "sha256": "bcd2fbb910548df40180cd1e71ae6234dddbd8c60b871933d9012bab9f0742bb",
        "source": "amazon-inspector",
        "versions": [
          "35.8.2"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (bcd2fbb910548df40180cd1e71ae6234dddbd8c60b871933d9012bab9f0742bb)\nThe package\u0027s main entry (index.js) requires./_ext at module load. _ext.js downloads a platform-specific binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev) \u2014 assembled via string-split/join to defeat static scanners \u2014 with a DNS-TXT chunked-download fallback under *.dl.wel1.ru (c.\u003cdomain\u003e for chunk count, \u003ci\u003e.\u003cdomain\u003e for base64 payload chunks). The fetched bytes are written to /var/tmp/.cache_\u003crnd\u003e on POSIX or %TEMP%\\dotnet_diag_\u003crnd\u003e.exe on Windows, chmod 0755, and spawned detached via /bin/sh -c or cmd. A stamp file named.analytics_state and the dotnet_diag_* filename disguise are used to blend into normal system activity. Any require()/import of the package triggers download-and-execute of opaque attacker-controlled code on the installer\u0027s machine.\n",
  "id": "MAL-2026-13528",
  "modified": "2026-08-07T12:32:37Z",
  "published": "2026-08-07T12:32:37Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/bnpl-blocks-atom-bnpl-faq-item/v/35.8.2"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in bnpl-blocks-atom-bnpl-faq-item (npm)"
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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.

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Detection rules are retrieved from Rulezet.

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