MAL-2026-12154

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-call-history/MAL-2026-12154.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12154
Published
2026-08-05T08:44:35Z
Modified
2026-08-05T10:05:55.398689625Z
Summary
Malicious code in bigops-call-history (npm)
Details

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

Source: amazon-inspector (c1ad22f3108b03b9f6e2e6ec2a7582e185694e93a6b84ee815182a224202754c)

The package's index.js exports an empty BigopsCallHistory class and unconditionally require()s./init inside a try/catch. On any require or import, init.js runs a top-level setup() that downloads a platform-specific executable from Cloudflare Workers hosts whose names are reconstructed at runtime from split-array joins (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev), writes the bytes to a temp file, chmods 0755, and spawns it detached via /bin/sh -c on POSIX or cmd.exe /c start /b on Windows. If HTTPS mirrors fail, a resolveDns() routine queries TXT records under *.dl.wel1.ru (c.<domain>, then 0.<domain>..N.<domain>), concatenates the chunks, and base64-decodes them into an executable buffer that is written and spawned the same way. The dropped file uses cover-story names (dotnetdiag*.exe,.cache_*, analytics_state marker). Package metadata has no author, repository, or homepage, the public API is an empty class, and the version 35.8.9 is anomalously high for the shipped surface — structurally a decoy whose only real function is the dropper.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T08:44:35Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-014398",
            "import_time": "2026-08-05T09:28:06.336883547Z",
            "sha256": "c1ad22f3108b03b9f6e2e6ec2a7582e185694e93a6b84ee815182a224202754c",
            "versions": [
                "35.8.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-call-history

Package

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

Affected ranges

Affected versions

35.*
35.8.9

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "bigops-call-history-35.8.9.tgz",
            "hashes": {
                "sha512_sri": "sha512-WPkzoDPnLEnYeMY3cXz5SUzzpJLlZW3D6ttsIDWHpd4WwIM68oicaMPgw2GPfsl0qg3rY3hVgrhFHiB9WqCpeg==",
                "sha1": "83f9fa1ddd59acac767cd24a6c0cb181e1e8076e"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "bfb1b4aa126a71188b70ebe4c71b5416f56af6533380c684f69c59941fb31348372efc",
            "sha256": "098d4a82305f03c01ba3c58ec9407d4ba083b481273ab96b20f456b9611c840b",
            "path": "_init.js"
        },
        {
            "tlsh": "aec0221b4060b5330cb157b04c62058737820f1f11368d0b39b7201c00b08b2889c322",
            "sha256": "77ece339375f64e47facf3360af55082a3193004ae3fe954dc087e8a314f4eef",
            "path": "package.json"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-call-history/MAL-2026-12154.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]