mal-2026-17800

{
  "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/wallet_hd_derive/extconf.rb",
              "sha256": "10218e975f54a4f11fe3954e1b584a5f05054003bf5773c3c2b8cceaa74ba763",
              "tlsh": "9751775acf8359e55aa1c0c045798012faa3ab0a50646875f3ee0868ff59b26c0f12fe"
            },
            {
              "path": "metadata.yaml",
              "sha256": "639cb5f77c70768369244c0d5b86590757eb2974587d812c5eecd673758acb18",
              "tlsh": "0311dd80eb83f43af405d3db98412ba3b373d60cfea53910cae78292438446d6b53122"
            }
          ]
        },
        "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/wallet-hd-derive/MAL-2026-17800.json"
      },
      "package": {
        "ecosystem": "RubyGems",
        "name": "wallet-hd-derive",
        "purl": "pkg:gem/wallet-hd-derive"
      },
      "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-2026-021363",
        "import_time": "2026-10-11T14:17:59.436369913Z",
        "modified_time": "2026-10-11T13:47:58Z",
        "sha256": "fdfb31a6866dee961d55ad503da9de33a2cf743b52c80862e4380519ad5bef12",
        "source": "amazon-inspector",
        "versions": [
          "0.9.1"
        ]
      },
      {
        "import_time": "2026-10-13T23:14:40.241282564Z",
        "modified_time": "2026-10-11T07:05:31Z",
        "sha256": "4630595f8934769aa5dc9e63f62e4552e3cb3663dc5f03e5def0deeb3a8476e1",
        "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 (fdfb31a6866dee961d55ad503da9de33a2cf743b52c80862e4380519ad5bef12)\nThe gem is published as a crypto wallet utility but ships no native source; its gemspec declares extconf.rb as an extension so that `gem install` auto-executes it. extconf.rb decodes a base64-encoded Ruby payload and, after checking for sandbox and analysis signals (CI env, ephemeral hostnames, generated usernames matching patterns such as `uA\\d+`/sandbox/tester/analys/scanner, cwd under /tmp, /opt/rubygems, /workspace, low machine uptime) and confirming developer-identifying files (`~/.ssh`, `~/.gem/credentials`, etc.), double-forks a detached process via fork + Process.setsid, sleeps for 20–40 minutes, then opens a TCP connection to 45.138.12.177:8089 and pipes /bin/sh in both directions using TCPSocket and IO.popen/IO.copy_stream. The shipped library at lib/wallet_hd_derive.rb exposes only two no-op methods (`build_id='ok'`, `healthy?=true`) and the README is branded for an unrelated package (`bitcoin-rpc-lite`), confirming the gem exists solely as a delivery vehicle for the install-time backdoor. The destination IP, base64 encoding of the payload, sandbox-evasion gating, and delayed reverse-shell establishment give a remote operator interactive /bin/sh on any developer or CI host that installs the gem.\n\n## Source: ossf-package-analysis (4630595f8934769aa5dc9e63f62e4552e3cb3663dc5f03e5def0deeb3a8476e1)\nThe OpenSSF Package Analysis project identified 'wallet-hd-derive' @ 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-2026-17800",
  "modified": "2026-10-13T23:30:05.102980622Z",
  "published": "2026-10-11T07:05:31Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://rubygems.org/gems/wallet-hd-derive/versions/0.9.1"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "Malicious code in wallet-hd-derive (RubyGems)"
}