mal-2026-17792

{
  "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/nft_metadata_resolver/extconf.rb",
              "sha256": "10218e975f54a4f11fe3954e1b584a5f05054003bf5773c3c2b8cceaa74ba763",
              "tlsh": "9751775acf8359e55aa1c0c045798012faa3ab0a50646875f3ee0868ff59b26c0f12fe"
            }
          ]
        },
        "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/nft-metadata-resolver/MAL-2026-17792.json"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "nft-metadata-resolver",
        "purl": "pkg:gem/nft-metadata-resolver"
      },
      "versions": [
        "0.9.1"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    },
    {
      "contact": [
        "https://github.com/ossf/package-analysis",
        "https://openssf.slack.com/channels/package_analysis"
      ],
      "name": "OpenSSF: Package Analysis",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-021366",
        "import_time": "2026-10-11T14:17:59.680862705Z",
        "modified_time": "2026-10-11T13:48:27Z",
        "sha256": "ee87c382dfd443e81b4cf0e8dc66749f9a129bd4239f984859aaaf760e84c629",
        "source": "amazon-inspector",
        "versions": [
          "0.9.1"
        ]
      },
      {
        "import_time": "2026-10-13T23:14:39.710433545Z",
        "modified_time": "2026-10-11T07:25:28Z",
        "sha256": "6025ab6524365bfb72f42951bbd78d214e309ae007eae9150f11c84503c77cdf",
        "source": "ossf-package-analysis",
        "versions": [
          "0.9.1"
        ]
      }
    ]
  },
  "details": "\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (ee87c382dfd443e81b4cf0e8dc66749f9a129bd4239f984859aaaf760e84c629)\nThe gem ships a native-extension script at ext/nft_metadata_resolver/extconf.rb that RubyGems auto-executes during `gem install`. The script carries a base64-encoded Ruby payload, decodes it with Base64.decode64 and runs it via eval inside a double-forked, detached, delayed child process. The decoded payload opens a TCP connection to the hardcoded bare-IP endpoint 45.138.12.177:8089 and bridges /bin/sh standard I/O to that socket using IO.popen and IO.copy_stream in both directions, giving the remote endpoint an interactive shell on the installer's host. Execution is gated by sandbox-evasion checks that skip CI environments, ephemeral or sandbox hostnames, generated analyst-shaped usernames, analysis working directories, and hosts with short uptimes, firing only when developer-shaped home-directory signals are present. The gem's advertised identity is inconsistent with its contents: the package is published as nft-metadata-resolver, the README describes a 'bitcoin-rpc-lite' library, and the extension declares a makefile target named bitcoin_rpc_lite_native while shipping no native C/C++ source for a real addon build. The extconf.rb's sole purpose is to decode and execute the embedded payload.\n\n## Source: ossf-package-analysis (6025ab6524365bfb72f42951bbd78d214e309ae007eae9150f11c84503c77cdf)\nThe OpenSSF Package Analysis project identified 'nft-metadata-resolver' @ 0.9.1 (rubygems) as malicious.\n\nIt is considered malicious because:\n\n- The package executes one or more commands associated with malicious behavior.\n",
  "id": "MAL-2026-17792",
  "modified": "2026-10-13T23:30:05.010775073Z",
  "published": "2026-10-11T07:25:28Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://rubygems.org/gems/nft-metadata-resolver/versions/0.9.1"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Malicious code in nft-metadata-resolver (RubyGems)"
}