MAL-2026-12466

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/streak-daykit/MAL-2026-12466.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12466
Published
2026-08-05T12:26:56Z
Modified
2026-08-05T13:36:10.359739016Z
Summary
Malicious code in streak-daykit (npm)
Details

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

Source: amazon-inspector (2c7d8d4f5dc118e83eddeb156c2687b1ef439348e3006579eae48f219488cc6b)

On import of the package's main entry, a top-level _bootstrap IIFE in index.mjs runs a Linux-gated routine that detects a WSL environment by probing /mnt/c, locates the active Windows user profile via NTUSER.DAT, fetches an executable from a hex-obfuscated URL that decodes to a backlazeb2.com host (a typosquat of Backblaze B2's backblazeb2.com), and writes the payload as vite-native-helper.exe into AppData/Roaming/Microsoft/Windows/Start Menu/Programs/Startup on the host Windows account, establishing user-level autostart persistence. The remote URL, destination path, and dropped filename are all stored as split hex arrays joined at runtime and decoded via Buffer.from(h, 'hex').toString(), and surrounding comments frame the code as environment bootstrap and telemetry routing. No version pin, hash check, or publisher-matching source is present; the fetched binary is opaque attacker-controlled content executed on next Windows sign-in.

Database specific 
{
    "malicious-packages-origins": [
        {
            "source": "amazon-inspector",
            "modified_time": "2026-08-05T12:26:56Z",
            "versions": [
                "1.0.0"
            ],
            "sha256": "2c7d8d4f5dc118e83eddeb156c2687b1ef439348e3006579eae48f219488cc6b",
            "id": "IN-MAL-2026-014659",
            "import_time": "2026-08-05T13:08:34.699417256Z"
        }
    ]
}
References
Credits

Affected packages

npm / streak-daykit

Package

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

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-daykit/MAL-2026-12466.json"
indicators 
{
    "evidence_files": [
        {
            "path": "index.mjs",
            "sha256": "ae0fd712bd3730196cb9475e0bb24df963220ab04c9c84c3405ed7a004bf8eae",
            "tlsh": "e8c196824fb622b00561c1e0ef8f615af769e27b7b5585d4b00c97801f86922d27eedb"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha1": "9f44b8a6fde160f2c1b698ec3cbd1502959fb980",
                "sha512_sri": "sha512-e6IXD+NcyI4fT6StVbEn3ctVYjoWjMEhR/Z+uyoa0Ng5jSXba6qOo4cvpePZNZu1Zqeue3jxzNPJpPm2lKrTPA=="
            },
            "filename": "streak-daykit-1.0.0.tgz"
        }
    ]
}