Malicious code in @s4yhiitestpoc/scan-https-d (npm)

{
  "id": "64d48b9469dbe165f36a6e7f7524950b0457f008fab04019e74d382d2669c452",
  "url": "https://osv.dev/vulnerability/MAL-2026-17766",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in @s4yhiitestpoc/scan-https-d (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. 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 (1a1dd63de3f5e380c573cd6bcf885c9d0c7a5c503959dfde1a6c8b963a6ddaea) On `npm install`, postinstall.js collects installer host identity — os.hostname(), os.userInfo().username, home directory, cwd, non-internal network interface addresses, DNS servers, and platform/arch/release — and POSTs it as JSON over HTTPS to the hardcoded endpoint https://collector.oob.s4yhii.com/_npm-poc/beacon, with a secondary DNS lookup against *.oob.s4yhii.com as an out-of-band execution signal. The package's scope (`@s4yhiitestpoc/*`) and metadata self-describe this as a dependency-confusion proof-of-concept targeting internal namespaces that resolve to the public registry; the self-labeling does not change the fact that installer host identifiers leave the installer's machine on install to a hardcoded third-party domain the installer did not opt into. ## Source: ghsa-malware (457a0590dc86280c4cf92455b4121b0e46a63a7",
    "evidence": "osv:MAL-2026-17766",
    "products": [
      {
        "name": {
          "value": "@s4yhiitestpoc/scan-https-d",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.0",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-17766",
      "aliases": [
        "GHSA-96fg-4mp3-2hj5",
        "MAL-2026-17766"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0"
                }
              ]
            }
          ],
          "package": {
            "name": "@s4yhiitestpoc/scan-https-d",
            "purl": "pkg:npm/%40s4yhiitestpoc/scan-https-d",
            "ecosystem": "npm"
          },
          "versions": [
            "1.0.0"
          ],
          "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/scan-https-d/MAL-2026-17766.json",
            "indicators": {
              "evidence_files": [
                {
                  "path": "postinstall.js",
                  "tlsh": "fa51a75512b0237137f12ad0a84e54f5d322c3a6795979e4b18d02846bcb4fa42b62fb",
                  "sha256": "f23aca67400de96abcfaa7a7c0ef987ebe14cef43467110595c8abc4a51f532d"
                }
              ],
              "package_integrity": [
                {
                  "hashes": {
                    "sha1": "f50c0ae29c524e0f135059f4c3779ed2906c2dd1",
                    "sha512_sri": "sha512-1xxUqIEv1UbxyZhi/GGYOFDfw1ezF4Ny8LGm/Vas2bWUU97X+dl/PrgOkV7zsbSazyk69DzGPuDw6lhN10jzbw=="
                  },
                  "filename": "scan-https-d-1.0.0.tgz"
                }
              ]
            }
          }
        }
      ],
      "modified": "2026-10-26T01:15:03.522114293Z",
      "provider": "osv",
      "references": [
        "https://www.npmjs.com/package/@s4yhiitestpoc/scan-https-d/v/1.0.0",
        "https://github.com/advisories/GHSA-96fg-4mp3-2hj5"
      ],
      "provider_metadata": {
        "iocs": {
          "urls": [
            "https://collector.oob.s4yhii.com/_npm-poc/beacon"
          ],
          "files": [
            {
              "paths": [
                "package/postinstall.js"
              ],
              "source": "PACKAGE_ARCHIVE",
              "digests": {
                "sha256": "f23aca67400de96abcfaa7a7c0ef987ebe14cef43467110595c8abc4a51f532d"
              }
            }
          ],
          "domains": [
            "collector.oob.s4yhii.com",
            "oob.s4yhii.com"
          ]
        },
        "malicious-packages-origins": [
          {
            "id": "IN-MAL-2026-021434",
            "sha256": "1a1dd63de3f5e380c573cd6bcf885c9d0c7a5c503959dfde1a6c8b963a6ddaea",
            "source": "amazon-inspector",
            "versions": [
              "1.0.0"
            ],
            "import_time": "2026-10-11T14:18:05.348764552Z",
            "modified_time": "2026-10-11T13:58:59Z"
          },
          {
            "id": "GHSA-96fg-4mp3-2hj5",
            "ranges": [
              {
                "type": "SEMVER",
                "events": [
                  {
                    "introduced": "0"
                  }
                ]
              }
            ],
            "sha256": "457a0590dc86280c4cf92455b4121b0e46a63a7ce8bef4705fc71320e775e1ac",
            "source": "ghsa-malware",
            "import_time": "2026-10-26T00:59:31.619411905Z",
            "modified_time": "2026-10-26T00:13:30Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 446260,
  "published_at": "2026-10-11T13:58:59+00:00"
}