MAL-2026-12597

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-todo-test/MAL-2026-12597.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12597
Published
2026-08-05T14:06:41Z
Modified
2026-08-05T14:35:41.798687165Z
Summary
Malicious code in checkout-todo-test (npm)
Details

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

Source: amazon-inspector (a87cb6c1e9ab39c21cd5d1031cadd2c192f86aaa337a62a7476657d5ee3f7f39)

On require of this package, index.js loads platform.js, which asynchronously downloads a platform-specific binary from anonymous Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev), with a DNS-TXT covert-channel fallback that reassembles a base64 payload from numbered subdomain records under *.dl.wel1.ru. The destination hostnames are assembled at runtime by joining split string fragments to evade static analysis. The downloaded bytes are written to a temp path with a disguised name (.cacheXXXX on Unix, dotnetdiagXXXX.exe on Windows), chmod 0755 on Unix, and executed via cp.spawn("/bin/sh", ["-c", fp + " &"], {detached:true}) or cmd.exe /c start /b. There is no hash or signature verification, and the hosts are not publisher-controlled infrastructure. The tarball also ships an unreferenced sibling module lib/telemetry.js (~81 KB) containing the same download→chmod→spawn pattern as latent staged code. The package presents its behavior as "telemetry/analytics" with env-var opt-outs, but the runtime-reconstructed C2 destinations, DNS covert channel, and disguised on-disk artifacts are inconsistent with legitimate telemetry.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "a87cb6c1e9ab39c21cd5d1031cadd2c192f86aaa337a62a7476657d5ee3f7f39",
            "id": "IN-MAL-2026-015168",
            "modified_time": "2026-08-05T14:06:41Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:08.94795422Z",
            "versions": [
                "35.5.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-todo-test

Package

Name
checkout-todo-test
View open source insights on deps.dev
Purl
pkg:npm/checkout-todo-test

Affected ranges

Affected versions

35.*
35.5.9

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "97f50054098ef31a1d2afbf56dc6ee2e57105feda680e83c6ef2aed38ea6cfe5",
            "path": "_platform.js",
            "tlsh": "bfa1b75a11a670198bb09bf08717441af65be66333c0c5d8fb9c99981f7312483b1efc"
        },
        {
            "sha256": "dbd28bd8265095e18aea4017c760468e1810bfab802a5c2b0a7245534883418b",
            "path": "lib/telemetry.js",
            "tlsh": "ed835056566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-UKuU0VdEfA05hobDCD+kRpMw5LwwIo8HihIZzkbc1JxzLspmNrReRK/jI+nnR4lZLrSsp4JUEZKI9behyFS5Ng==",
                "sha1": "4c04f0c82cec02648fdb357d692ccbe9b17126c6"
            },
            "filename": "checkout-todo-test-35.5.9.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/checkout-todo-test/MAL-2026-12597.json"