MAL-2026-13234

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-procedure-player/MAL-2026-13234.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13234
Published
2026-08-05T15:36:04Z
Modified
2026-08-05T16:50:04.995879765Z
Summary
Malicious code in bigops-procedure-player (npm)
Details

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

Source: amazon-inspector (4e28923577eff8eba09d7ebbd941220727c1851cf46ef25f4de8960070ad33bb)

On require(), index.js loads loader.js, which reconstructs delivery hostnames at runtime via array.join("") (e.g. oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev) and fetches an OS-specific binary via https.get. A fallback path assembles the payload from base64 chunks in DNS TXT records under *.dl.wel1.ru (a count record at c.<domain> and per-chunk records at <i>.<domain>). The received bytes are written to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnetdiag<hex>.exe on Windows, chmod'd 755 via a string-concatenated fs["chmod"+"Sync"], and executed detached via cp.spawn("/bin/sh", ["-c", fp+" &"]) or the cmd equivalent. Filenames masquerade as system cache/diagnostic artifacts and the delivery hosts are unrelated to the package publisher. lib/telemetry.js contains a duplicate fetch->chmod 755->detached-spawn dropper body that is not reached from index.js in this version but mirrors the same loader shape.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "4e28923577eff8eba09d7ebbd941220727c1851cf46ef25f4de8960070ad33bb",
            "source": "amazon-inspector",
            "modified_time": "2026-08-05T15:36:04Z",
            "versions": [
                "35.8.2"
            ],
            "import_time": "2026-08-05T16:13:42.327151192Z",
            "id": "IN-MAL-2026-015761"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-procedure-player

Package

Name
bigops-procedure-player
View open source insights on deps.dev
Purl
pkg:npm/bigops-procedure-player

Affected ranges

Affected versions

35.*
35.8.2

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha1": "c67e30743bb7ad5312715f4664bcdcd9c92befc5",
                "sha512_sri": "sha512-4HQBEEfM99psOQw2vMJcV5eEEuYPWSiH7wa8SZ0g3NB/KU4gDJZ2/t+1/0Etf4hLCWoP1NqdAL5Sp31i73hInQ=="
            },
            "filename": "bigops-procedure-player-35.8.2.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_loader.js",
            "sha256": "96e8439a645c98a4c4af75a2f140a3b0829f2ac5b61bb312b6736b628fd7c80e",
            "tlsh": "f1a1959a166a70194bb0abe08717482af65be66337c0c2c4f75ca9885f735248371dfc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "8488b20b88a566462a6b923a1eb50e84a1ec8e40a2c858ca6e493b46fea15616",
            "tlsh": "c3835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-procedure-player/MAL-2026-13234.json"