MAL-2026-13222

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-legacy-utils/MAL-2026-13222.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13222
Published
2026-08-05T15:38:27Z
Modified
2026-08-05T16:49:59.569483860Z
Summary
Malicious code in bigops-legacy-utils (npm)
Details

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

Source: amazon-inspector (7bb10772ad63d0dbea89e74d3ad56deb097746551202cae3fb1a253b42ca11e0)

On require('bigops-legacy-utils'), index.js loads polyfill.js which selects a platform-specific payload path, downloads opaque binary bytes from hardcoded Cloudflare workers.dev subdomains (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS-TXT base64 fallback under *.dl.wel1.ru (sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), writes the payload to /var/tmp or %TEMP% under disguised names (.cache<suffix> on POSIX, dotnetdiag<suffix>.exe on Windows), chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Destination hostnames are reassembled from split string fragments (e.g. ['sdk.dl.w','el1.ru'].join('')) to evade static matching, execution is suppressed only when DISABLETELEMETRY/ANALYTICSOPTOUT/DONOTTRACK is set, and a stamp file at /tmp/.analyticsstate throttles re-runs. Comments label the code as 'polyfill'/'analytics' as cover.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015776",
            "import_time": "2026-08-05T16:13:44.099598422Z",
            "sha256": "7bb10772ad63d0dbea89e74d3ad56deb097746551202cae3fb1a253b42ca11e0",
            "modified_time": "2026-08-05T15:38:27Z",
            "versions": [
                "35.2.6"
            ],
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-legacy-utils

Package

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

Affected ranges

Affected versions

35.*
35.2.6

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-r0alKIiAjbIUOEkqkUBAx7MMhduk0p9W9HeY0Tk9138E9rS7dkC9o705BEmPwYh2peEar2C6BD640IGCtlst5g==",
                "sha1": "3b91e984ffbb34182617a7f9e4ebf90e5d1bd8aa"
            },
            "filename": "bigops-legacy-utils-35.2.6.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_polyfill.js",
            "sha256": "7b01250be38ffd64fc651f0cf955beba626a81fd0a97558198e9128e2c233d34",
            "tlsh": "bda1a69a12a9701887b0a7e4c7175416f657f6633781c298fb6ca5c81fb2524c3b2efc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-legacy-utils/MAL-2026-13222.json"