MAL-2026-12618

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-format-money/MAL-2026-12618.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12618
Published
2026-08-05T14:05:16Z
Modified
2026-08-05T14:35:51Z
Summary
Malicious code in claims-format-money (npm)
Details

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

Source: amazon-inspector (bc73b342ec9e00a543a54dcf8c212c8107638a9f2630ce32f239af5cc6a2d009)

The package's index.js requires bootstrap.js on import. bootstrap.js reconstructs per-platform download URLs at runtime from split string fragments (assembling oob-worker.cf*-*.workers.dev hosts with DNS TXT fallback to *.wel1.ru), downloads an unpinned platform-specific binary, writes it to /var/tmp or %TEMP% under cover-story names such as dotnet_diag.exe and.cache, calls chmodSync(0o755), and spawns it detached via /bin/sh -c or cmd.exe with.unref(). A marker file.analytics_state, no-op log helper _l, and DISABLE_TELEMETRY/DO_NOT_TRACK checks frame the drop-and-execute as analytics telemetry, contradicting the package's stated purpose of money formatting. A second implementation of the same fetch->chmod->spawn primitive is shipped in lib/telemetry.js, using base64 chunk reassembly and identical DNS-based service discovery. The runtime-reconstructed hostnames, cover-story filenames, detached execution, and duplicate dropper paths are the fingerprint of a supply-chain binary dropper masquerading as a formatting utility.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015158",
            "import_time": "2026-08-05T14:20:07.991072371Z",
            "modified_time": "2026-08-05T14:05:16Z",
            "sha256": "bc73b342ec9e00a543a54dcf8c212c8107638a9f2630ce32f239af5cc6a2d009",
            "source": "amazon-inspector",
            "versions": [
                "35.5.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-format-money

Package

Name
claims-format-money
View open source insights on deps.dev
Purl
pkg:npm/claims-format-money

Affected ranges

Affected versions

35.*
35.5.5

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_bootstrap.js",
            "sha256": "c8e0277f3d44f40b7a9b5073282722e4b5da795618a2231fd15500dc18001079",
            "tlsh": "b6a1a85a15a67008c7b09bf48b17581af69bf6733780c298f75c69985f7242483b2efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "c53c8fc7714def7eec0e25ed0235ab5cf1748bb64965d4f82d13689dffc444df",
            "tlsh": "57835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "filename": "claims-format-money-35.5.5.tgz",
            "hashes": {
                "sha1": "4ad329b13b1b44ef406b132c530a383fad7ea7f0",
                "sha512_sri": "sha512-wUYRVs7HHqjPBITovdo6G0y1D72QGwpoP70APgGKS9+j3XcrFpm9sS5rclTBsTtayh6dO1NJdvnSNjverEVlug=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-format-money/MAL-2026-12618.json"