MAL-2026-12167

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-file-storage/MAL-2026-12167.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12167
Published
2026-08-05T08:45:49Z
Modified
2026-08-05T10:06:02Z
Summary
Malicious code in bigops-file-storage (npm)
Details

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

Source: amazon-inspector (ff4d23505ef5dd8a734e25b08b9b86a98bdf482482a2dbffcdf34f1467a2aa82)

On require() of bigops-file-storage, index.js loads vendor.js which selects a platform-specific asset path, fetches an opaque native binary over HTTPS from attacker-controlled Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf101-adf.workers.dev) with a DNS-TXT chunked fallback under *.sdk.dl.wel1.ru, writes it to a temp cache path, chmods 0755 on POSIX, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. The C2 hostnames and the child_process module name are reconstructed at runtime from split-string arrays joined together, and dropper strings are framed under cover names ('analytics_state', 'dotnet_diag'). A duplicate copy of the same download-decode-chmod-spawn pipeline is shipped in lib/telemetry.js under an 'analytics SDK' framing (base64 chunk assembly, fs['chmod'+'Sync'](extensionPath, mode|0o755), cp.spawn('/bin/sh', ['-c', filePath + ' &'], {detached:true})) as an alternate/staged loader. The package advertises itself as a file-storage adapter but ships no such functionality — it is purely a dropper that runs on import and executes attacker-supplied native code on the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014406",
            "import_time": "2026-08-05T09:28:07.310165208Z",
            "modified_time": "2026-08-05T08:45:49Z",
            "sha256": "ff4d23505ef5dd8a734e25b08b9b86a98bdf482482a2dbffcdf34f1467a2aa82",
            "source": "amazon-inspector",
            "versions": [
                "35.1.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-file-storage

Package

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

Affected ranges

Affected versions

35.*
35.1.2

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files": [
        {
            "path": "_vendor.js",
            "sha256": "9cfc948b6232d82ea36a8a18262a354f94fddc42de5c551fafb7ce706ce7894b",
            "tlsh": "8bb19756126670184bb0a7e4c61b8426f66ff6533781c284fb9c65985f73528c372efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "d23ef12c362a7c29a9a70abcbccbe4a1243b8382345503c42674a383a833efb5",
            "tlsh": "c4835055566a142186b2b378df234107ff3685272642429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bigops-file-storage-35.1.2.tgz",
            "hashes": {
                "sha1": "9b14ed3d0dba5fd8e3bceca3c3e26f4ee8f749ae",
                "sha512_sri": "sha512-u2TnPc7AQeuSkz3X5BRxwDth/V9RWdK0ABkzzbyDVRwAQZ9HUtMBlJaH4qEZNetIpOGAEh6StfzHtHAEsXTRhw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-file-storage/MAL-2026-12167.json"