MAL-2026-6308
Vulnerability from ossf_malicious_packages
Published
2026-06-22 12:00
Modified
2026-06-23 19:34
Summary
Malicious code in @lazyutil/dater (npm)
Details

@lazyutil/dater (malicious versions 0.8.1, 0.9.2, 0.9.3, and 0.9.4, published by lazyutil-78muyg@wshu.net) is a trojanized npm package belonging to the wshu.net credential-stealer campaign. The campaign published trojanized look-alike utility packages across 12+ scopes whose publisher accounts all follow the pattern -<6 random chars>@wshu.net, with every scope created on June 4, 2026 in a ~40-minute burst. This package masquerades as a date library and ships real, working utility code so it passes a glance, while bundling a much larger malicious payload (lib/tzinit.js in the earliest variant, dist/lib/tzinit.cjs thereafter). package.json declares a postinstall hook (e.g. "node ./dist/lib/tzinit.cjs") that runs the payload automatically on npm install. The payload is heavily obfuscated with javascript-obfuscator (hex-named identifiers, a while (!![]) array-rotation IIFE, base64+RC4 string decoding, control-flow flattening, and runtime-decrypted module resolution to stay out of the static module graph). At runtime it is a Chromium browser credential stealer: it reads Chromium Cookies and Login Data and decrypts saved passwords protected by AES-256-GCM (the v10/v11 app-bound key schemes), then exfiltrates them over HTTPS using a spoofed Mozilla/5.0 user agent. Consistent with the campaign, the dangerous versions sit in mid-ranges while the latest tag (0.9.5) points to a scrubbed release with an empty scripts block. The 0.9.4 payload blob is byte-identical to @glitchpad/throttler@2.2.3 from the same campaign. Malicious payload dist/lib/tzinit.cjs (0.9.4) SHA-256: 68b4fe54a4c05cd0115535ebd4aa8d3cccb03ea5a685f440314814ba1b89e875.


-= Per source details. Do not edit below this line.=-

Source: amazon-inspector (362ed214c96b3a091355472cb7d03ca7dcb1c3b1c36daede92d4e7a04027cb8a)

@lazyutil/dater is a trojanized repackage of the legitimate timezonecomplete library. Its package.json declares postinstall: node./dist/lib/tzinit.cjs, which runs automatically on npm install. tzinit.cjs is a 263 KB obfuscator.io-protected file (string-array RC4/XOR + control-flow flattening) that uses AES-256-GCM with a hardcoded key/IV/AAD to decrypt an embedded URL and host, then performs an HTTP GET to fetch a binary, writes it to disk, chmods it executable, and spawns it via process.execPath or sh -c. The dropper is platform-gated for win32/darwin/linux, retries with backoff, and re-execs the package's process. None of this is required for a date/timezone library and the legitimate upstream has neither a postinstall nor a tzinit.cjs. Trojanization signals: package description is copied verbatim from timezonecomplete, the repository field still points at the upstream author's git URL (github.com/rogierschouten/timezonecomplete), homepage points at a placeholder github.com/lazyutil, and author is a fresh ProtonMail identity unrelated to the original maintainer. Installing this package gives an attacker arbitrary code execution on the installer's machine.

CWE
  • CWE-506 - The product contains code that appears to be malicious in nature.
  • CWE-506 - The product contains code that appears to be malicious in nature.
  • CWE-506 - The product contains code that appears to be malicious in nature.
  • CWE-506 - The product contains code that appears to be malicious in nature.
  • CWE-506 - The product contains code that appears to be malicious in nature.
Credits

{
  "affected": [
    {
      "database_specific": {
        "cwes": [
          {
            "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.",
            "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"
          }
        ],
        "indicators": {
          "evidence_files": [
            {
              "path": "dist/lib/tzinit.cjs",
              "sha256": "68b4fe54a4c05cd0115535ebd4aa8d3cccb03ea5a685f440314814ba1b89e875",
              "tlsh": "6e445151a3c9bc8012479f767b5ef2e9fa290aac745408afd404bd54bbfa507dbe0630"
            },
            {
              "path": "package.json",
              "sha256": "8b768658e4e12b0dd77170bd4d14e7ebc16927db68bdddcc954d8544f889bb31",
              "tlsh": "67218c3cc4354d633ee87ad4ac6a7845677148074e547d1432cb04ac8b8e2eb52bf2ee"
            }
          ],
          "package_integrity": [
            {
              "filename": "dater-0.9.2.tgz",
              "hashes": {
                "sha1": "2f7e922ccb07ac36f1c7205d7a7cee133a1fb98f",
                "sha512_sri": "sha512-WW55u7N8p6FY4r0DWyRcGWebN3XxsjdHOOLfiO4FTNrdyv99yxMoPtJ8LaXsAxobWsBSzMQOufEvSmENqo4KwA=="
              }
            }
          ]
        }
      },
      "package": {
        "ecosystem": "npm",
        "name": "@lazyutil/dater"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "SEMVER"
        }
      ],
      "versions": [
        "0.9.2",
        "0.8.1",
        "0.9.4",
        "0.9.5",
        "0.9.3"
      ]
    }
  ],
  "credits": [
    {
      "contact": [
        "inspector-research@amazon.com"
      ],
      "name": "Amazon Inspector",
      "type": "FINDER"
    },
    {
      "contact": [
        "https://safedep.io"
      ],
      "name": "SafeDep",
      "type": "FINDER"
    }
  ],
  "database_specific": {
    "malicious-packages-origins": [
      {
        "id": "IN-MAL-2026-007295",
        "import_time": "2026-06-23T16:54:15.639200311Z",
        "modified_time": "2026-06-23T16:22:40Z",
        "sha256": "1e60ea16a2304b00c24feeb56b14387e7b137e4e832eebeef61536bbdc30ee64",
        "source": "amazon-inspector",
        "versions": [
          "0.9.2"
        ]
      },
      {
        "id": "IN-MAL-2026-007298",
        "import_time": "2026-06-23T16:54:15.940425918Z",
        "modified_time": "2026-06-23T16:22:43Z",
        "sha256": "3085d5883cb7184bb57024ffe4bb1c5760ea3b120ce4b4dee03c874b3cbc62d4",
        "source": "amazon-inspector",
        "versions": [
          "0.8.1"
        ]
      },
      {
        "id": "IN-MAL-2026-007293",
        "import_time": "2026-06-23T16:54:15.517199005Z",
        "modified_time": "2026-06-23T16:22:37Z",
        "sha256": "362ed214c96b3a091355472cb7d03ca7dcb1c3b1c36daede92d4e7a04027cb8a",
        "source": "amazon-inspector",
        "versions": [
          "0.9.4"
        ]
      },
      {
        "id": "IN-MAL-2026-007294",
        "import_time": "2026-06-23T16:54:15.586697918Z",
        "modified_time": "2026-06-23T16:22:38Z",
        "sha256": "af4babebb1ad40ecc1260f2036da3052003e645d7edfdcc5d03bd6105748659d",
        "source": "amazon-inspector",
        "versions": [
          "0.9.5"
        ]
      },
      {
        "id": "IN-MAL-2026-007297",
        "import_time": "2026-06-23T16:54:15.828809301Z",
        "modified_time": "2026-06-23T16:22:43Z",
        "sha256": "c55953491fa63e65d06f8db1855ea4ae815244b2c0b7590f609ca0b460928181",
        "source": "amazon-inspector",
        "versions": [
          "0.9.3"
        ]
      }
    ]
  },
  "details": "@lazyutil/dater (malicious versions 0.8.1, 0.9.2, 0.9.3, and 0.9.4, published by lazyutil-78muyg@wshu.net) is a trojanized npm package belonging to the wshu.net credential-stealer campaign. The campaign published trojanized look-alike utility packages across 12+ scopes whose publisher accounts all follow the pattern \u003cscope\u003e-\u003c6 random chars\u003e@wshu.net, with every scope created on June 4, 2026 in a ~40-minute burst. This package masquerades as a date library and ships real, working utility code so it passes a glance, while bundling a much larger malicious payload (lib/tzinit.js in the earliest variant, dist/lib/tzinit.cjs thereafter). package.json declares a postinstall hook (e.g. \"node ./dist/lib/tzinit.cjs\") that runs the payload automatically on npm install. The payload is heavily obfuscated with javascript-obfuscator (hex-named identifiers, a while (!![]) array-rotation IIFE, base64+RC4 string decoding, control-flow flattening, and runtime-decrypted module resolution to stay out of the static module graph). At runtime it is a Chromium browser credential stealer: it reads Chromium Cookies and Login Data and decrypts saved passwords protected by AES-256-GCM (the v10/v11 app-bound key schemes), then exfiltrates them over HTTPS using a spoofed Mozilla/5.0 user agent. Consistent with the campaign, the dangerous versions sit in mid-ranges while the latest tag (0.9.5) points to a scrubbed release with an empty scripts block. The 0.9.4 payload blob is byte-identical to @glitchpad/throttler@2.2.3 from the same campaign. Malicious payload dist/lib/tzinit.cjs (0.9.4) SHA-256: 68b4fe54a4c05cd0115535ebd4aa8d3cccb03ea5a685f440314814ba1b89e875.\n\n---\n_-= Per source details. Do not edit below this line.=-_\n\n## Source: amazon-inspector (362ed214c96b3a091355472cb7d03ca7dcb1c3b1c36daede92d4e7a04027cb8a)\n@lazyutil/dater is a trojanized repackage of the legitimate `timezonecomplete` library. Its package.json declares `postinstall: node./dist/lib/tzinit.cjs`, which runs automatically on `npm install`. tzinit.cjs is a 263 KB obfuscator.io-protected file (string-array RC4/XOR + control-flow flattening) that uses AES-256-GCM with a hardcoded key/IV/AAD to decrypt an embedded URL and host, then performs an HTTP GET to fetch a binary, writes it to disk, chmods it executable, and spawns it via `process.execPath` or `sh -c`. The dropper is platform-gated for win32/darwin/linux, retries with backoff, and re-execs the package\u0027s process. None of this is required for a date/timezone library and the legitimate upstream has neither a postinstall nor a tzinit.cjs. Trojanization signals: package description is copied verbatim from `timezonecomplete`, the `repository` field still points at the upstream author\u0027s git URL (`github.com/rogierschouten/timezonecomplete`), `homepage` points at a placeholder `github.com/lazyutil`, and `author` is a fresh ProtonMail identity unrelated to the original maintainer. Installing this package gives an attacker arbitrary code execution on the installer\u0027s machine.\n",
  "id": "MAL-2026-6308",
  "modified": "2026-06-23T19:34:37Z",
  "published": "2026-06-22T12:00:00Z",
  "references": [
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/@lazyutil/dater/v/0.9.2"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/@lazyutil/dater/v/0.8.1"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/@lazyutil/dater/v/0.9.4"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/@lazyutil/dater/v/0.9.5"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/@lazyutil/dater/v/0.9.3"
    },
    {
      "type": "REPORT",
      "url": "https://safedep.io/wshu-net-npm-credential-stealer-campaign/"
    },
    {
      "type": "PACKAGE",
      "url": "https://www.npmjs.com/package/@lazyutil/dater"
    }
  ],
  "schema_version": "1.7.4",
  "summary": "Malicious code in @lazyutil/dater (npm)"
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

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