MAL-2026-12171

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-informer/MAL-2026-12171.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12171
Published
2026-08-05T08:46:55Z
Modified
2026-08-05T10:06:03.752092991Z
Summary
Malicious code in bigops-informer (npm)
Details

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

Source: amazon-inspector (324bb851ecf14c623080e07471bd23a7ea505bc6db244c654895a1cce71bf7e8)

On require(), index.js loads bootstrap.js which reconstructs a set of destination hostnames from string-array joins (resolving to oob-worker.cf99-9b3.workers.dev, cf101-adf/cf102-baf/cf103-070.workers.dev, and sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru), downloads a platform-specific executable via https.get, writes it to a temp path under disguised names (dotnetdiag_*.exe /.cache_*), chmods it 0755, and spawns it detached via cp.spawn('/bin/sh', ['-c', fp+' &']) or spawn('cmd',...) on Windows. If the HTTPS mirrors fail, _bootstrap.js falls back to a DNS TXT covert channel: it resolves c.<domain> to get a chunk count, then resolves N.<domain> for each chunk, concatenates the base64 chunks, decodes them to a binary buffer, and writes+executes the result. The module also includes a TTL stamp and env-based opt-out checks consistent with hostile staging.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T08:46:55Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-014414",
            "import_time": "2026-08-05T09:28:08.564943614Z",
            "sha256": "324bb851ecf14c623080e07471bd23a7ea505bc6db244c654895a1cce71bf7e8",
            "versions": [
                "35.4.8"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-informer

Package

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

Affected ranges

Affected versions

35.*
35.4.8

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "bigops-informer-35.4.8.tgz",
            "hashes": {
                "sha512_sri": "sha512-GFnHLGwbcW0vy/Qzuvyll74az60T/hMu9MF8NV2SDJtG+nEgWvhuElNUnysGCeVWCw9/Qu5KzMYi/8kAi5eNAw==",
                "sha1": "fe7dd1286f9211877fdba637d8f49529e9aa51d4"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "35a1b95a16b670088bb09be48b175405f65ae6633780c6d4f79ca5d41fb703483b2efc",
            "sha256": "672aed4de18ddc69be7979e8a42b2e3b76ed45526ac3bff30759f50d1f1eba2e",
            "path": "_bootstrap.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-informer/MAL-2026-12171.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]