Malicious code in semer (PyPI)

{
  "id": "fabd2c64f6a408cbfab117188971221f8423b61f6e250bf302766f2c7a92e4b9",
  "url": "https://osv.dev/vulnerability/MAL-2026-18118",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Malicious code in semer (PyPI)",
    "summary": "--- _-= Per source details. Do not edit below this line.=-_ ## Source: kam193 (7479f42de6f963e39b7aa1409b586e605dca69978763ab35236d20c9126aa4f1) During installation, package downloads and executes malware. --- Category: MALICIOUS - The campaign has clearly malicious intent, like infostealers. Campaign: 2026-10-semvver Reasons (based on the campaign): - Downloads and executes a remote executable. - malware - typosquatting",
    "evidence": "osv:MAL-2026-18118",
    "products": [
      {
        "name": {
          "value": "semer",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [],
        "affected_versions": [
          {
            "value": "1.0.0",
            "evidence": "/affected/0/versions"
          }
        ]
      }
    ],
    "severity": "unknown",
    "structured": {
      "id": "MAL-2026-18118",
      "aliases": [
        "MAL-2026-18118"
      ],
      "affected": [
        {
          "package": {
            "name": "semer",
            "purl": "pkg:pypi/semer",
            "ecosystem": "PyPI"
          },
          "versions": [
            "1.0.0"
          ],
          "database_specific": {
            "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/pypi/semer/MAL-2026-18118.json"
          }
        }
      ],
      "modified": "2026-10-22T23:45:03.963963545Z",
      "provider": "osv",
      "references": [
        "https://www.virustotal.com/gui/file/e6d96b5500b232bea67f6f9046cfbc22d29a515c42d2af9523a15ebe8a7c4ab7/",
        "https://bad-packages.kam193.eu/pypi/package/semer"
      ],
      "provider_metadata": {
        "iocs": {
          "urls": [
            "https://c2-worker.crawlnet-claim.workers.dev/dl/pyupd"
          ],
          "domains": [
            "c2-worker.crawlnet-claim.workers.dev"
          ]
        },
        "malicious-packages-origins": [
          {
            "id": "pypi/2026-10-semvver/semer",
            "sha256": "7479f42de6f963e39b7aa1409b586e605dca69978763ab35236d20c9126aa4f1",
            "source": "kam193",
            "versions": [
              "1.0.0"
            ],
            "import_time": "2026-10-20T23:38:02.547920843Z",
            "modified_time": "2026-10-20T23:02:04.089029Z"
          },
          {
            "id": "pypi/2026-10-semvver/semer",
            "sha256": "77a83c900954eea717ed30c2ec5f6e51b1b0b4a9591409845af5eadce09f4dfb",
            "source": "kam193",
            "versions": [
              "1.0.0"
            ],
            "import_time": "2026-10-22T23:38:53.987882051Z",
            "modified_time": "2026-10-20T23:02:04.089029Z"
          }
        ]
      }
    },
    "related_cves": [],
    "security_relevant": true,
    "severity_evidence": null
  },
  "source_id": "core-osv",
  "document_id": 410164,
  "published_at": "2026-10-20T23:02:04+00:00"
}