MAL-2026-12846

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-timers/MAL-2026-12846.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12846
Published
2026-08-05T15:01:16Z
Modified
2026-08-05T15:50:14.797321773Z
Summary
Malicious code in bigops-timers (npm)
Details

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

Source: amazon-inspector (da3857e871cb391df75568052701aae6a172eedcee963519c5e6ac9feeff9cbb)

On require() of bigops-timers, index.js loads compat.js which downloads a platform-specific binary from Cloudflare Workers hosts (oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS TXT-record chunked fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru. The fetched bytes are written to /tmp or %TEMP% under masquerade filenames such as.cache<rand> and dotnetdiag<rand>.exe, chmod 0755 is applied on Unix, and the file is spawned detached via /bin/sh -c '<file> &' or cmd.exe /c start. Destination hostnames, resolver domains, and the child_process module name are assembled by Array.join('') from split string fragments to evade static analysis. No hash or signature verification is performed, destinations are mutable and unrelated to the declared 'timers' purpose, and a second variant of the same fetch-chmod-spawn pipeline ships in lib/telemetry.js framed as an analytics SDK. Any consumer that installs or requires this package receives remote code execution under the installing user.

Database specific 
{
    "malicious-packages-origins": [
        {
            "versions": [
                "35.9.5"
            ],
            "import_time": "2026-08-05T15:19:56.646265425Z",
            "sha256": "da3857e871cb391df75568052701aae6a172eedcee963519c5e6ac9feeff9cbb",
            "modified_time": "2026-08-05T15:01:16Z",
            "id": "IN-MAL-2026-015536",
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-timers

Package

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

Affected ranges

Affected versions

35.*
35.9.5

Database specific

cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-vIBJaNrMWKMOWGf2+sCopS9INmAqyR0UG3OyIDWmTLWypye6JGZs56sA1WkZIAcs68NR/UCqVmep/btbqZtVjg==",
                "sha1": "8fe6b297c97a7b1d147533f5f2b5f3941f531776"
            },
            "filename": "bigops-timers-35.9.5.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_compat.js",
            "sha256": "cc75a1e990805a104f0033754913a7f5923c206c98d859ffd7021b5251c622b3",
            "tlsh": "38a186aa15a670194bb0dbf4c7174415f65af6a33380c298fb5c65981f7316483b2efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "d9e0760402fe367f1aeecec7846df051d84393d7fd0cd77e3fae126fd1a48ff2",
            "tlsh": "1b835055566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-timers/MAL-2026-12846.json"