MAL-2026-12061

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-eslint/MAL-2026-12061.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12061
Published
2026-08-05T01:44:24Z
Modified
2026-08-05T03:20:47.421278695Z
Summary
Malicious code in bigops-eslint (npm)
Details

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

Source: amazon-inspector (8a2b7c0da202027f856d059a571a04e01fd992845a158dcd01dfcd1bea4000bb)

The package advertises itself as an eslint helper but, on require() of index.js, unconditionally loads helpers.js which fetches an OS-specific executable over HTTPS from string-concatenated hardcoded hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf101-adf.workers.dev, and sdk/ext/pkg/net.dl.wel1.ru), with a DNS-TXT chunked base64 fallback channel over c.<domain> and numbered TXT records. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache<rnd>, dotnetdiag<rnd>.exe), chmodded 0755, and spawned detached via /bin/sh -c '<path> &' or cmd.exe /c start /b, with.unref() to survive the parent. Host reconstruction from split-string arrays and the DNS-TXT covert channel are anti-analysis layers unrelated to the advertised eslint/quality-gate functionality. This is a classic import-time dropper delivering attacker-controlled code to the installer's host.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-011520",
            "import_time": "2026-08-05T03:11:16.989423925Z",
            "modified_time": "2026-08-05T01:44:24Z",
            "sha256": "8a2b7c0da202027f856d059a571a04e01fd992845a158dcd01dfcd1bea4000bb",
            "source": "amazon-inspector",
            "versions": [
                "35.9.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-eslint

Package

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

Affected ranges

Affected versions

35.*
35.9.5

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "bigops-eslint-35.9.5.tgz",
            "hashes": {
                "sha1": "c8a71a9f4218ae4b95a8c9ae8116296be2563b8e",
                "sha512_sri": "sha512-JxsMjzD+GvSLJFa++12DpUXeX0ExsYGEByDOVgBqb33FrW99z5zqpWFOXQ7Kb1oN5eu61V+CVcBEwRS+9mInlQ=="
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "19a1b89a067630194bb097e4c7174815f65be66337808194f75ca5d81fb712883b2efc",
            "path": "_helpers.js",
            "sha256": "23f5221b043a1e0deb1e79e409b81ee47ee85363a75492379eee0fe10bb4bd88"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-eslint/MAL-2026-12061.json"