MAL-2026-5923

See a problem?
Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@welcome-onboarding-web/mobile-focus-account-beta-merging/MAL-2026-5923.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-5923
Published
2026-06-16T19:59:43Z
Modified
2026-06-16T21:16:47Z
Summary
Malicious code in @welcome-onboarding-web/mobile-focus-account-beta-merging (npm)
Details

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

Source: amazon-inspector (5587680c29332345c8dd87172c03e0ba20f858c968d16c5a6c34717b8e95bcf5)

scripts/postinstall.js is heavily obfuscated (obfuscator.io with rotated base64-RC4 string array and a self-defending regex tamper check that infinite-loops on debuggers/beautifiers). On npm install, the postinstall hook walks up from process.cwd() to fingerprint the parent project, selects a remote URL based on os.platform() (linux/darwin/win32), fetches the response body via http(s).get into a Buffer, writes it to a file under os.tmpdir(), then spawns it via child_process.spawn(process.execPath, [tmpFile], {detached: true, stdio: 'ignore', env: {...process.env,...}}).unref() — a classic detached install-time remote code dropper that ships the installer's full environment to the spawned process. The package's library surface is non-functional (declared main dist/index.js only re-exports ../src/index.js, but no src/ directory ships in the tarball), and the publisher identity (welcome-onboarding-web.io with fabricated jira/docs/github/npm subdomains) does not correspond to a real organization. The package's only effect on install is execution of the obfuscated dropper.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-006830",
            "import_time": "2026-06-16T21:06:47.272952437Z",
            "modified_time": "2026-06-16T19:59:43Z",
            "sha256": "5587680c29332345c8dd87172c03e0ba20f858c968d16c5a6c34717b8e95bcf5",
            "source": "amazon-inspector",
            "versions": [
                "4.28.7"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / @welcome-onboarding-web/mobile-focus-account-beta-merging

Package

Name
@welcome-onboarding-web/mobile-focus-account-beta-merging
View open source insights on deps.dev
Purl
pkg:npm/%40welcome-onboarding-web%2Fmobile-focus-account-beta-merging

Affected ranges

Affected versions

4.*
4.28.7

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": "scripts/postinstall.js",
            "sha256": "4bc5e05d09e3656ba6759916eab4d0f3b6b81e415d0279a3ac2e77507c5acddf",
            "tlsh": "155265017f84d942631bcbbb6a2771d0e06e1c5a7644088ef225f7b9fd94726e6d0e31"
        },
        {
            "path": "package.json",
            "sha256": "2b99b5be5c19e877ca14363ca204d64cef1277fee1346859611ff8895f99f6f0",
            "tlsh": "d121ee31c6289e3756c45989ffa8560978360c5b0948fc0c2ac7016c4bce15724bf73e"
        }
    ],
    "package_integrity": [
        {
            "filename": "mobile-focus-account-beta-merging-4.28.7.tgz",
            "hashes": {
                "sha1": "87d2afd43d61111a93b5b9232079a46fb0023080",
                "sha512_sri": "sha512-KRoVS9dmiJYz+IJAj64m3GRj48ifcNQRxHyPOYfeW4kqgfhP5sBLb43jv+tulgAB/ZM/rou6LVkRMMUei1OjvA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/@welcome-onboarding-web/mobile-focus-account-beta-merging/MAL-2026-5923.json"