MAL-2026-12468

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/streak-math-kit/MAL-2026-12468.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12468
Published
2026-08-05T12:38:43Z
Modified
2026-08-05T13:36:11.635435365Z
Summary
Malicious code in streak-math-kit (npm)
Details

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

Source: amazon-inspector (6ba4f1a9b23ca375fed98868d8ca488ec722b473060834412b0b1b23f5cae37a)

streak-math-kit@1.0.0 is advertised as a math primitives library but its index.mjs top-level IIFE bootstrap() runs on any import and drops a hex-embedded Windows PE named vite-native-helper.exe onto the host. Execution is gated by platform==='linux' && NODEENV!=='production' to target WSL developer environments. The code enumerates /mnt/c/Users/* to locate a Windows user profile (identified by the presence of AppData and NTUSER.DAT), then hex-decodes an approximately 500KB embedded binary with an MZ/PE header and writes it to that user's AppData/Roaming/Microsoft/Windows/Start Menu/Programs/Startup directory, where Windows auto-executes it on the next logon. Path segments (AppData, Roaming, Startup subpath, NTUSER.DAT, the filename vite-native-helper.exe) are stored as hex-encoded string arrays and reassembled at runtime via Buffer.from(h,'hex') to hide the Windows-targeting behavior from casual source review. Source comments state the module has no network or filesystem side effects, contradicting the observed behavior. Result: any developer who imports this package from a WSL shell gains a persistent Windows executable that runs at every subsequent Windows logon.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014741",
            "modified_time": "2026-08-05T12:38:43Z",
            "versions": [
                "1.0.0"
            ],
            "source": "amazon-inspector",
            "import_time": "2026-08-05T13:08:42.532154769Z",
            "sha256": "6ba4f1a9b23ca375fed98868d8ca488ec722b473060834412b0b1b23f5cae37a"
        }
    ]
}
References
Credits

Affected packages

npm / streak-math-kit

Package

Name
streak-math-kit
View open source insights on deps.dev
Purl
pkg:npm/streak-math-kit

Affected ranges

Affected versions

1.*
1.0.0

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/streak-math-kit/MAL-2026-12468.json"
indicators 
{
    "evidence_files": [
        {
            "path": "index.mjs",
            "sha256": "b390f08edf15528db2d4da7dc5fac70742fe936744f3ea8a73894f95c40134d1",
            "tlsh": "d6b4c5e0da459681f15bd488b0c0bed209353697badc0cf2d3be1d08dfafaa62555b4c"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "069ea222c977e53208185aa853a2865ad283db86",
                "sha512_sri": "sha512-qfQLLFwjDzrdDV3t5dZG3GhjfzsR0pwh6noQW+M+g2Q28Ww7O05jOdprbpPh6pnRFGJE/kAb/a0yFZOZe7hTXA=="
            },
            "filename": "streak-math-kit-1.0.0.tgz"
        }
    ]
}