MAL-2026-12853

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-utils/MAL-2026-12853.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12853
Published
2026-08-05T14:59:18Z
Modified
2026-08-05T15:50:18.239968494Z
Summary
Malicious code in bigops-utils (npm)
Details

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

Source: amazon-inspector (36dcb322eace39209bb0092ab7ea7c658481887a48eff948f116bfb7909ec131)

Loading the package's main entry point auto-invokes helpers.js init(), which downloads an OS-specific binary from obfuscated Cloudflare Workers subdomains (hostnames assembled at runtime from split-string arrays such as MIRRORS=['oob-worker.cf102-baf.w','orke','rs.','de','v'].join('')) with a DNS-TXT chunked fallback that reassembles base64 chunks from TXT records under *.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under deceptive names ('.cache<rand>', 'dotnetdiag<rand>.exe'), chmod'd 0755, and detached-spawned via spawn('/bin/sh', ['-c', fp+' &'], {detached:true}) or cmd.exe /c start /b. No hash or signature verification is performed and the destinations are not tied to any advertised publisher. Sibling lib/telemetry.js uses dynamic API construction (require('child'+'process'), fs['chmod'+'Sync']) to further evade static analysis. The behavior is framed as 'analytics/telemetry' but is an import-time remote-code dropper.

Database specific 
{
    "malicious-packages-origins": [
        {
            "versions": [
                "35.4.8"
            ],
            "import_time": "2026-08-05T15:19:56.011535528Z",
            "sha256": "36dcb322eace39209bb0092ab7ea7c658481887a48eff948f116bfb7909ec131",
            "modified_time": "2026-08-05T14:59:18Z",
            "id": "IN-MAL-2026-015523",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-utils

Package

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

Affected ranges

Affected versions

35.*
35.4.8

Database specific

cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-j00jKChS6tLfhTp062RagJh2pGKBnH9jjvWAwWyh9P+L2MxNC9s4aXsip+AutpKle5uwz4ISbCS8Hz6Tjn1Rhg==",
                "sha1": "b222b6c71700676b311eff358b2cfd2f2cb4208a"
            },
            "filename": "bigops-utils-35.4.8.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_helpers.js",
            "sha256": "1a8da11952bcec274c2fd7cc9ae8dfdb8e3ab2ae48bc5b42a06ea9cc62261903",
            "tlsh": "49b1986a156670184bb0d7e4c7176415f65ae5637380c2a4fb9ca9d81fb312483b3efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-utils/MAL-2026-12853.json"