MAL-2026-3769

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Import Source

https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/prettier-lint-lenz/MAL-2026-3769.json

JSON Data

https://api.osv.dev/v1/vulns/MAL-2026-3769

Published

2026-05-14T19:25:15Z

Modified

2026-05-15T07:51:35.668368Z

Summary

Malicious code in prettier-lint-lenz (npm)

Details

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

Source: amazon-inspector (28f7035dda69170600724a31f4b3543e02ac23c9153f3a62c35f2ee5264eef44)

Package impersonates the popular prettier formatter — README and description are copied verbatim from the real Prettier project, but the package ships no formatter code. Instead, package.json declares "postinstall": "node index.mjs", which on Windows POSTs an install beacon to a hardcoded bare-IP C2 (http://204.10.194.64:5000/api/nonce), copies a bundled prettier-lint/ directory to %LOCALAPPDATA%\prettier-lint, and executes ctll.mjs from the deployed location. ctll.mjs writes a hidden VBScript runner and registers a Windows Scheduled Task named CdllProtect with a LogonTrigger (schtasks /Create /XML) that relaunches cdll.mjs via wscript.exe //nologo in a hidden window on every user logon, with 999 retries and no execution time limit. The deployed cdll.mjs polls the clipboard every ~250ms via powershell.exe Get-Clipboard -Raw and POSTs the raw clipboard text as JSON to the same hardcoded endpoint over plain HTTP on every change, exfiltrating passwords, 2FA codes, wallet addresses, and any copied text. All three components (install-time beacon, deployed worker, persistence) share the attacker-controlled endpoint 204.10.194.64:5000.

Database specific

{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-002706",
            "sha256": "28f7035dda69170600724a31f4b3543e02ac23c9153f3a62c35f2ee5264eef44",
            "modified_time": "2026-05-14T19:25:15Z",
            "versions": [
                "1.0.0"
            ],
            "import_time": "2026-05-15T07:37:17.487092762Z",
            "source": "amazon-inspector"
        },
        {
            "id": "IN-MAL-2026-002707",
            "sha256": "81348c27286005b3399de72570527ed0afc1414830a74fae852229bcfda31e01",
            "modified_time": "2026-05-14T19:25:15Z",
            "versions": [
                "2.6.4"
            ],
            "import_time": "2026-05-15T07:37:17.579703965Z",
            "source": "amazon-inspector"
        }
    ]
}

References

Credits

- Amazon Inspector - FINDER
- - actran@amazon.com

Affected packages

npm / prettier-lint-lenz

Package

Name: prettier-lint-lenz; View open source insights on deps.dev
Purl: pkg:npm/prettier-lint-lenz

Affected ranges

Affected versions

1.*

1.0.0

2.*

2.6.4

Database specific

cwes

[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]

indicators

{
    "evidence_files": [
        {
            "path": "README.md",
            "sha256": "f1f5a86cd0fd0f6a288882527830a9bbbd5851e3238c4d7426b7bbb496165cd1",
            "tlsh": "3b61ddb385a5074c67c086d0dad93848ea1bbdefbec13548ece9c7327b441e9456718b"
        },
        {
            "path": "index.mjs",
            "sha256": "75e96575895242a3370297d99314ec583140ef9fb9d99e5eee8ac047f6ee66f5",
            "tlsh": "a53103e340b74f701bf255cabe1ed87712e701113649bc64bd6e4b389bda428960258d"
        },
        {
            "path": "prettier-lint/cdll.mjs",
            "sha256": "36474b07d134b1cb0619bd374247861d4a213bc853f0f277112c5087f8b58036",
            "tlsh": "1cb1a85a94fe0a36c3b330785b1fe05652679103374deda0b99c0a60bfa64398657acd"
        },
        {
            "path": "prettier-lint/ctll.mjs",
            "sha256": "571bb394b72fd8d3efef691b06fd3ed66257373812caf229bb51ea6af3067bdb",
            "tlsh": "4d81fa0b6892c7310ff232c4241ed95927bf01133a85e98077ec86b5afb706a82725c9"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "e4d96da8ce9384c4ff4e17e7b072423e4bd5ad56",
                "sha512_sri": "sha512-YqVgAg9sGZXiYyHT+9bDrJZD+rdKBcfWyjxGoe0xhdmjQUJLAtBQX1OpR4afWuikwu0z3LyMF0oF0HNqEzoqhg=="
            },
            "filename": "prettier-lint-lenz-1.0.0.tgz"
        }
    ]
}

source

"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/prettier-lint-lenz/MAL-2026-3769.json"