Malicious code in @s4yhiitestpoc/r3-https (npm)

{
  "id": "f41289403757adb87f5ce1dc8f35d77001693258f417be5138a14f44aa7ab067",
  "url": "https://osv.dev/vulnerability/MAL-2026-17765",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in @s4yhiitestpoc/r3-https (npm)",
    "summary": "Dependency-confusion proof-of-concept package. A postinstall script runs automatically on installation and sends host and user identifiers (hostname, username, home directory, network interface addresses, platform details and npm configuration) to collector.oob.s4yhii.com, with a secondary DNS lookup under oob.s4yhii.com. It also performs a reverse DNS lookup of the host's own address and records the name and path of the project that installed it. The script states it is bug-bounty research and does not read secrets or file contents. Any machine that installed this package disclosed the listed host information to a third party. --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (b2638f8970897121676d5dc3ed7c002ab9d9ccc3e400283e165297a95e3c1423) On npm install, postinstall.js automatically collects host identity (hostname, username, uid/gid, homedir, platform, release), enumerates network interfaces (addresses, MACs, CIDRs), reads DNS servers and internal reverse-DNS names, captures npm/CI environment markers and container/runtime indicators, and walks up to eight parent directories to locate the consuming project's package.json and extract its name, version, declaring dependency field, and declared version range. The collected data is POSTed over HTTPS to the hardcoded endpoint collector.oob.s4yhii.com at path /_npm-poc/beacon, and a parallel DNS lookup to a labeled subdomain under *.oob.s4yhii.com is issued as an out-of-band beacon. The co",
    "evidence": "osv:MAL-2026-17765",
    "products": [
      {
        "name": {
          "value": "@s4yhiitestpoc/r3-https",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.0",
            "evidence": "/affected/0/versions"
          },
          {
            "value": "0.0.0-stage",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-17765",
      "aliases": [
        "GHSA-798w-mj69-gc2x",
        "MAL-2026-17765"
      ],
      "affected": [
        {
          "package": {
            "name": "@s4yhiitestpoc/r3-https",
            "purl": "pkg:npm/%40s4yhiitestpoc/r3-https",
            "ecosystem": "npm"
          },
          "versions": [
            "1.0.0",
            "0.0.0-stage"
          ],
          "database_specific": {
            "cwes": [
              {
                "name": "Embedded Malicious Code",
                "cweId": "CWE-506",
                "description": "The product contains code that appears to be malicious in nature."
              },
              {
                "name": "Embedded Malicious Code",
                "cweId": "CWE-506",
                "description": "The product contains code that appears to be malicious in nature."
              },
              {
                "name": "Embedded Malicious Code",
                "cweId": "CWE-506",
                "description": "The product contains code that appears to be malicious in nature."
              }
            ],
            "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@s4yhiitestpoc/r3-https/MAL-2026-17765.json",
            "indicators": {
              "evidence_files": [
                {
                  "path": "postinstall.js",
                  "tlsh": "aae1f86a05fe113222623af4694b50156776d1633504fbf4b9dd8280afcf0ba42bb7ed",
                  "sha256": "cd0d3b55a0161d658c6efcdf4bc172c2a5eccf86e67b380a801662f35fa552fb"
                }
              ],
              "package_integrity": [
                {
                  "hashes": {
                    "sha1": "a8c089e4e2420b847c2eda403438548f3628df51",
                    "sha512_sri": "sha512-8eSPg8kwnyi7318K28Gv5HqSHeAz3faWIDW997zmoMmNeUAxcrUOzIAh0x5WB/ljIublvzYqLqhMPnPaxlyCoQ=="
                  },
                  "filename": "r3-https-1.0.0.tgz"
                }
              ]
            }
          }
        }
      ],
      "modified": "2026-10-13T23:45:04.806501915Z",
      "provider": "osv",
      "references": [
        "https://www.npmjs.com/package/@s4yhiitestpoc/r3-https/v/1.0.0",
        "https://github.com/advisories/GHSA-798w-mj69-gc2x"
      ],
      "provider_metadata": {
        "iocs": {
          "urls": [
            "https://collector.oob.s4yhii.com/_npm-poc/beacon"
          ],
          "files": [
            {
              "paths": [
                "package/postinstall.js"
              ],
              "source": "PACKAGE_ARCHIVE",
              "digests": {
                "sha256": "cd0d3b55a0161d658c6efcdf4bc172c2a5eccf86e67b380a801662f35fa552fb"
              }
            }
          ],
          "domains": [
            "collector.oob.s4yhii.com",
            "oob.s4yhii.com"
          ]
        },
        "malicious-packages-origins": [
          {
            "id": "IN-MAL-2026-021431",
            "sha256": "b2638f8970897121676d5dc3ed7c002ab9d9ccc3e400283e165297a95e3c1423",
            "source": "amazon-inspector",
            "versions": [
              "1.0.0"
            ],
            "import_time": "2026-10-11T14:18:05.039301185Z",
            "modified_time": "2026-10-11T13:58:31Z"
          },
          {
            "id": "GHSA-798w-mj69-gc2x",
            "sha256": "ff183ad61b543f94eaae7b4408fed43c924470b6a672090d0500b4836ff36bba",
            "source": "ghsa-malware",
            "versions": [
              "1.0.0",
              "0.0.0-stage"
            ],
            "import_time": "2026-10-12T19:24:46.905348583Z",
            "modified_time": "2026-10-12T18:56:10Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 313754,
  "published_at": "2026-10-11T13:58:31+00:00"
}