MAL-2026-13514

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/eacq-core/MAL-2026-13514.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13514
Published
2026-08-07T12:11:32Z
Modified
2026-08-07T12:35:17Z
Summary
Malicious code in eacq-core (npm)
Details

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

Source: amazon-inspector (b500358c69db5b11d186a6656bd7e20b6ae98cf8f8b437af7b320d511f870761)

On require() of eacq-core, both helpers.js and lib/telemetry.js download a platform-specific binary from Cloudflare Workers hosts assembled at runtime via string-splitting (oob-worker.cf100-416.workers.dev, oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev) with a DNS-TXT fallback to *.dl.wel1.ru, write the bytes to /tmp/.cache or %TEMP%\dotnet_diag_.exe, chmod 0755 (via fs['chmod'+'Sync']), and spawn the file detached through '/bin/sh -c &' or 'cmd /c start'. No hash or signature verification is performed and the destinations are unrelated to any legitimate publisher. child_process is loaded through require('child_'+'process') and hostnames are assembled via.join('') to evade static analysis. Cover-story comments framing the code as an 'Analytics SDK' with 'opt-out env vars' accompany the payload. The fetch-and-execute chain fires unconditionally at module load, giving whoever controls the Workers hosts arbitrary code execution on any machine that installs or imports this package.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-016876",
            "import_time":  "2026-08-07T12:23:25.38104546Z",
            "modified_time":  "2026-08-07T12:11:32Z",
            "sha256":  "b500358c69db5b11d186a6656bd7e20b6ae98cf8f8b437af7b320d511f870761",
            "source":  "amazon-inspector",
            "versions":  [
                "35.8.1"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / eacq-core

Package

Name
eacq-core
View open source insights on deps.dev
Purl
pkg:npm/eacq-core

Affected ranges

Affected versions

35.*
35.8.1

Database specific

cwes 
[
    {
        "cweId":  "CWE-506",
        "description":  "The product contains code that appears to be malicious in nature.",
        "name":  "Embedded Malicious Code"
    }
]
indicators 
{
    "evidence_files":  [
        {
            "path":  "_helpers.js",
            "sha256":  "7be3d58dc23259dce7a933f383d0d1225056079778a1e1b08fb8bb1f370eac36",
            "tlsh":  "12a1b65616fa30180692e5d8842f9816b49ff6533284d9d4fb4c76984feb27883b29fc"
        },
        {
            "path":  "lib/telemetry.js",
            "sha256":  "f8388c6cc9b9acda8a03931fac9e285ce219aa9bf2c66419c011b9caf8d83dbe",
            "tlsh":  "5c73304966fb10214263b0685ebb40437635c4072a4aed5dba9c43ec9f8db3896f1fb9"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "eacq-core-35.8.1.tgz",
            "hashes":  {
                "sha1":  "a2829990f759fbde4cde3a7d6cea0c8a99b459a8",
                "sha512_sri":  "sha512-Ry5pHb/Wdq6hBrFp51PbzwMvvWPZ2OWp3XHiHCbMiwRLF+psBnLevSr27S1IisaD/tCGTypGbi+e3QKCftiKEQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/eacq-core/MAL-2026-13514.json"