MAL-2026-12648

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-use-visual-viewport-resizing/MAL-2026-12648.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12648
Published
2026-08-05T14:00:58Z
Modified
2026-08-05T14:36:06.818322639Z
Summary
Malicious code in claims-use-visual-viewport-resizing (npm)
Details

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

Source: amazon-inspector (19a43857f84078ff31ed3df04edf0708e622d0cc10143b7ee2f74e05182519eb)

On require, index.js loads helpers.js which auto-invokes start(). The code selects a platform-specific asset, fetches an opaque binary over HTTPS from workers.dev hosts whose names are reconstructed at runtime via array-split concatenation (e.g. "oob-worker.cf99-9b3.workers.dev"), with a DNS TXT-record fallback resolving via *.dl.wel1.ru subdomains that are similarly assembled from split fragments. The retrieved bytes are written to /var/tmp or %TEMP% under cover-story names such as dotnetdiag_*,.cache_*, or.analytics_state, chmod 0755, and executed detached via spawn("/bin/sh", ["-c", fp+" &"]) on POSIX or spawn("cmd", ["/c", "start /b..."]) on Windows. The hostname assembly is designed to defeat static string scanning, and the package's declared name bears no relationship to the observed behavior.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "19a43857f84078ff31ed3df04edf0708e622d0cc10143b7ee2f74e05182519eb",
            "id": "IN-MAL-2026-015130",
            "modified_time": "2026-08-05T14:00:58Z",
            "import_time": "2026-08-05T14:20:05.087206227Z",
            "source": "amazon-inspector",
            "versions": [
                "35.2.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-use-visual-viewport-resizing

Package

Name
claims-use-visual-viewport-resizing
View open source insights on deps.dev
Purl
pkg:npm/claims-use-visual-viewport-resizing

Affected ranges

Affected versions

35.*
35.2.8

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "2ab96471a92c41f3b01518a1e547955c842abd409582689f066dc241f199e648",
            "path": "_helpers.js",
            "tlsh": "80a1965a12aa70188bb09bf4c7174426f65be6633780d6c4f7ac95880f721248372dfc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-XY7pxy2rIIVoSpFw3yYHE7mt74KDHJy0KI3WpiXsLJqXD+ze6/11ldgrZy1NX2j9KHEGle9DrL3g/Jmkf6g4Kw==",
                "sha1": "a7ab23bf7cb6e9505d696aab1f9a9fb66485ef1d"
            },
            "filename": "claims-use-visual-viewport-resizing-35.2.8.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-use-visual-viewport-resizing/MAL-2026-12648.json"