MAL-2026-12133

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/accounts-forms/MAL-2026-12133.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12133
Published
2026-08-05T09:06:16Z
Modified
2026-08-05T10:05:45.106955667Z
Summary
Malicious code in accounts-forms (npm)
Details

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

Source: amazon-inspector (f17174f805fda0f57e8b471b2a788e92836a2c20d5da22e818ed43218503b0ed)

On require() of accounts-forms, index.js loads polyfill.js which selects a platform-specific URL and downloads an opaque binary over HTTPS from hardcoded Cloudflare Workers subdomains (oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT fallback under *.dl.well1.site. The downloaded bytes are written to a hidden path in /tmp (as.cache<hex>) or %TEMP% (as dotnetdiag<hex>.exe or analyticsstate), chmod 0755 on POSIX, and spawned detached via /bin/sh -c or cmd /c start. Destination hostnames are split across array-joined string fragments to evade static analysis, and the dropped binary uses cover-story filenames mimicking diagnostics/analytics artifacts. An opt-out gate keyed on generic telemetry environment variables (DISABLETELEMETRY, ANALYTICSOPTOUT, DONOTTRACK) further disguises the fetch-and-execute chain as telemetry. The fetched executable is unsigned, unversioned, unrelated to any documented package purpose, and delivers attacker-controlled code to the installer's host on load.

Database specific 
{
    "malicious-packages-origins": [
        {
            "modified_time": "2026-08-05T09:07:41Z",
            "source": "amazon-inspector",
            "sha256": "bc4d8be7b3e360413a04c895b17353dc61276c737614c629341c547f5b3c7bd9",
            "import_time": "2026-08-05T09:28:25.219363047Z",
            "id": "IN-MAL-2026-014556",
            "versions": [
                "0.0.2"
            ]
        },
        {
            "modified_time": "2026-08-05T09:06:16Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-014546",
            "import_time": "2026-08-05T09:28:24.22045899Z",
            "sha256": "f17174f805fda0f57e8b471b2a788e92836a2c20d5da22e818ed43218503b0ed",
            "versions": [
                "33.2.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / accounts-forms

Package

Name
accounts-forms
View open source insights on deps.dev
Purl
pkg:npm/accounts-forms

Affected ranges

Affected versions

0.*
0.0.2
33.*
33.2.6

Database specific

indicators 
{
    "package_integrity": [
        {
            "filename": "accounts-forms-0.0.2.tgz",
            "hashes": {
                "sha512_sri": "sha512-k1pRxzXpK2TFAKM4KBZhN/AHxuP49+MKp1l4DYTulrmbajWyZntem/EgMD8FbqlLbc51vKgsKUZe3FFLmsuy6A==",
                "sha1": "f006b5b8446ad77e707e91a90d4035772fd690a8"
            }
        }
    ],
    "evidence_files": [
        {
            "tlsh": "67b1a59a01b670198bb0e7e4cb179815f55bf25337818294f7aca9885f7712483b2efc",
            "sha256": "e0507454d65e6e1b2c7ba6664667948c3f28bd163f42421e73fa5b53fe3efe85",
            "path": "_polyfill.js"
        },
        {
            "tlsh": "d8835055566a142186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc",
            "sha256": "b4a215b693335019848967e1bb154c7abca9b013a9b1b23e6a296d2c9f120f9e",
            "path": "lib/telemetry.js"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/accounts-forms/MAL-2026-12133.json"
cwes 
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]