MAL-2026-13559
Vulnerability from ossf_malicious_packages
Published
2026-08-07 12:33
Modified
2026-08-07 12:33
Summary
Malicious code in dolyame-ui-collapseblock (npm)
Details

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

Source: amazon-inspector (ef9992e81f3de4cb9bd4391466d7850e953c19a0772ebbe5992953044466377c)

On require(), shim.js fetches an OS/architecture-specific native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) whose hostnames are reconstructed at runtime via array-join to evade static inspection. The payload is written to /tmp or %TEMP% under a disguised name (.cache on Unix, dotnet_diag_.exe on Windows), chmodded 0755, and spawned detached via /bin/sh -c or cmd. If HTTPS fetches fail, the loader falls back to a DNS-TXT covert channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, retrieving a chunk count from c. and reassembling a base64-encoded binary from sequentially-numbered subdomain TXT records. index.js requires _shim on load, so importing the package auto-executes the fetched attacker-controlled native binary with no version pinning, no hash or signature verification, and destinations unrelated to the package's stated purpose. A 21028-second cache stamp gates repeats and undocumented environment variables provide an operator opt-out, both consistent with hostile dropper tradecraft rather than legitimate functionality.

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": "_shim.js",
              "sha256": "0e8158e4aa76a286f520de3e54708eda541df671d703feee52a7893cf6d8a0b3",
              "tlsh": "44a1845a26fb30180793e5d4851f8826719af65333c4d9c4fb8c6a984fe653883b29fc"
            }
          ],
          "package_integrity": [
            {
              "filename": "dolyame-ui-collapseblock-35.8.1.tgz",
              "hashes": {
                "sha1": "0a8abfa47bbdc9e9bf6442549b3fbf16cba5a1e7",
                "sha512_sri": "sha512-AxhNpQ0OyuFNuGjdOTNUp11ihZGLsslQh0wUGEVafE+WL+BAfBkmwhVVnMcT6QpPBRUVl2s9zdOXrgL642fzGw=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "dolyame-ui-collapseblock"
      },
      "versions": [
        "35.8.1"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-017031",
        "import_time": "2026-08-07T12:51:22.926554919Z",
        "modified_time": "2026-08-07T12:33:49Z",
        "sha256": "ef9992e81f3de4cb9bd4391466d7850e953c19a0772ebbe5992953044466377c",
        "source": "amazon-inspector",
        "versions": [
          "35.8.1"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (ef9992e81f3de4cb9bd4391466d7850e953c19a0772ebbe5992953044466377c)\nOn require(), _shim.js fetches an OS/architecture-specific native binary from hardcoded Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev) whose hostnames are reconstructed at runtime via array-join to evade static inspection. The payload is written to /tmp or %TEMP% under a disguised name (.cache_\u003crand\u003e on Unix, dotnet_diag_\u003crand\u003e.exe on Windows), chmodded 0755, and spawned detached via /bin/sh -c or cmd. If HTTPS fetches fail, the loader falls back to a DNS-TXT covert channel under sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru, retrieving a chunk count from c.\u003cdomain\u003e and reassembling a base64-encoded binary from sequentially-numbered subdomain TXT records. index.js requires _shim on load, so importing the package auto-executes the fetched attacker-controlled native binary with no version pinning, no hash or signature verification, and destinations unrelated to the package\u0027s stated purpose. A 21028-second cache stamp gates repeats and undocumented environment variables provide an operator opt-out, both consistent with hostile dropper tradecraft rather than legitimate functionality.\n",
  "id": "MAL-2026-13559",
  "modified": "2026-08-07T12:33:49Z",
  "published": "2026-08-07T12:33:49Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/dolyame-ui-collapseblock/v/35.8.1"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in dolyame-ui-collapseblock (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.
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