MAL-2026-13547
Vulnerability from ossf_malicious_packages
Published
2026-08-07 12:36
Modified
2026-08-07 12:36
Summary
Malicious code in devplatform-spa-plugin-remote-module (npm)
Details

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

Source: amazon-inspector (995f8b1091ff43f5fae824ef6ac028895003b9a24960b78449cbc7b295aa34fd)

On require of the package, index.js loads support.js which downloads a platform-specific binary from string-split-obfuscated hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT fallback that reassembles a base64 payload from numbered subdomains under dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). The fetched binary is written to /var/tmp on Unix or %TEMP% on Windows under a disguised name (.cache or dotnet_diag_.exe), chmodded 0o755, and spawned detached via /bin/sh -c or cmd.exe /c start. Host strings and API names are reconstructed at runtime from array-join fragments (e.g., ["oob-worker.cf103-070.work","ers.d","ev"].join("")) to evade static analysis. A second module lib/telemetry.js ships the same dropper primitives with require("child_" + "process") and fs["chmod"+"Sync"] indirection, bundled as a ready-to-wire payload alongside the active dropper.

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": "_support.js",
              "sha256": "33a2beb5d94d15afefa2ea1fc4d00bf07288bea6d291312e5c38ec0c0daa3380",
              "tlsh": "b1a1946a05aa70184b70dbf4c617541af65af66373808698fb9c95c81ff251483b2efc"
            },
            {
              "path": "lib/telemetry.js",
              "sha256": "5e726c0075e2275d041c15f67d8c990ab7626b8f973117e9c9b142ed67d373d0",
              "tlsh": "f9835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
            }
          ],
          "package_integrity": [
            {
              "filename": "devplatform-spa-plugin-remote-module-35.9.6.tgz",
              "hashes": {
                "sha1": "968ec53267229b1f5d8acb644717c3d2068e379a",
                "sha512_sri": "sha512-sNY7df4BAyYCiNOFHpcXOx/8KLGer4Hmm+UvuwpsCkbtPzBWR9sSoVKPErtF2p65+TAOzRaCJzDSQgx5LIRI0w=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "devplatform-spa-plugin-remote-module"
      },
      "versions": [
        "35.9.6"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-017047",
        "import_time": "2026-08-07T12:51:23.777780628Z",
        "modified_time": "2026-08-07T12:36:14Z",
        "sha256": "995f8b1091ff43f5fae824ef6ac028895003b9a24960b78449cbc7b295aa34fd",
        "source": "amazon-inspector",
        "versions": [
          "35.9.6"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (995f8b1091ff43f5fae824ef6ac028895003b9a24960b78449cbc7b295aa34fd)\nOn require of the package, index.js loads _support.js which downloads a platform-specific binary from string-split-obfuscated hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev), with a DNS TXT fallback that reassembles a base64 payload from numbered subdomains under dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru). The fetched binary is written to /var/tmp on Unix or %TEMP% on Windows under a disguised name (.cache_\u003chex\u003e or dotnet_diag_\u003chex\u003e.exe), chmodded 0o755, and spawned detached via /bin/sh -c or cmd.exe /c start. Host strings and API names are reconstructed at runtime from array-join fragments (e.g., [\"oob-worker.cf103-070.work\",\"ers.d\",\"ev\"].join(\"\")) to evade static analysis. A second module lib/telemetry.js ships the same dropper primitives with require(\"child_\" + \"process\") and fs[\"chmod\"+\"Sync\"] indirection, bundled as a ready-to-wire payload alongside the active dropper.\n",
  "id": "MAL-2026-13547",
  "modified": "2026-08-07T12:36:14Z",
  "published": "2026-08-07T12:36:14Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/devplatform-spa-plugin-remote-module/v/35.9.6"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in devplatform-spa-plugin-remote-module (npm)"
}



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Sightings

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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.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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