MAL-2026-12299

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/twork-data-services-proxy-prime-api-v1-account-overdraft-info/MAL-2026-12299.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12299
Published
2026-08-05T09:15:05Z
Modified
2026-08-05T10:07:07.628098160Z
Summary
Malicious code in twork-data-services-proxy-prime-api-v1-account-overdraft-info (npm)
Details

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

Source: amazon-inspector (74e5494883e9415a6efbc2775e753d413e111f02709b95688c94e09013dc8db8)

On require() of this package, index.js loads adapter.js which selects a platform-specific asset path (/pkg/package, /pkg/package.exe, /pkg/loadermac, /pkg/package-arm64) and fetches an opaque native executable over HTTPS from hostnames reconstructed at runtime via array-join fragments (oob-worker.cf*-*.workers.dev), with a DNS TXT chunked-base64 fallback under *.dl.well1.site. The downloaded bytes are written to /var/tmp/.cache<rand> or %TEMP%/dotnetdiag<rand>.exe, chmod'd 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b. Network destinations and sensitive API names (childprocess, chmodSync) are assembled from split string fragments to evade static grepping. A second unreferenced dropper implementation in lib/telemetry.js (self-described 'Analytics SDK', 81KB) mirrors the same primitives at larger scale (cp.spawn('/bin/sh', ['-c', filePath+' &'], {detached:true}), fs['chmod'+'Sync'], base64 chunk decoding). The fetched payload host is unrelated to any stated package purpose, is mutable and anonymously-hosted, and delivers arbitrary native code that runs with the installer's privileges on every require.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014608",
            "import_time": "2026-08-05T09:28:30.047695124Z",
            "sha256": "74e5494883e9415a6efbc2775e753d413e111f02709b95688c94e09013dc8db8",
            "modified_time": "2026-08-05T09:15:05Z",
            "versions": [
                "20.7.4"
            ],
            "source": "amazon-inspector"
        }
    ]
}
References
Credits

Affected packages

npm / twork-data-services-proxy-prime-api-v1-account-overdraft-info

Package

Name
twork-data-services-proxy-prime-api-v1-account-overdraft-info
View open source insights on deps.dev
Purl
pkg:npm/twork-data-services-proxy-prime-api-v1-account-overdraft-info

Affected ranges

Affected versions

20.*
20.7.4

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-NzCv6MiqqECUqBX3Xq+ObRB9N1nw4cSU8prcMJ3gvovlcgjc6qo4xjHc6L3foZJVsRTDgjzMEYBGMLwkuT6wFw==",
                "sha1": "93894c3b4d46372f965a8d5a48a726935b5fdd2a"
            },
            "filename": "twork-data-services-proxy-prime-api-v1-account-overdraft-info-20.7.4.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_adapter.js",
            "sha256": "59a5d0891eb63d7dba6d9fc3473eb76e35c95178881290f932e32f23f76735ab",
            "tlsh": "81b1956a136630198bb0dbe4cb175415f65af5a333808294fb5c69985fb613883b2efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "77e586309f27635196cf87e75126d81b9133b1bc33cca33958eaa68b8e1fba82",
            "tlsh": "21835055566a242186b2b368df234007ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/twork-data-services-proxy-prime-api-v1-account-overdraft-info/MAL-2026-12299.json"