MAL-2026-12619

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-get-base-url/MAL-2026-12619.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12619
Published
2026-08-05T14:05:09Z
Modified
2026-08-05T14:35:52Z
Summary
Malicious code in claims-get-base-url (npm)
Details

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

Source: amazon-inspector (7e7b7dbbb58284ead0ecb4d93490e9683b4f58b31955d817de52495fb7399106)

index.js requires./setup on load, so any require() of this package triggers a dropper chain. setup.js selects a platform-specific payload path (linux/darwin/win32), downloads a binary over HTTPS from string-split-obfuscated hosts of the form oob-worker.cf10X-*.workers.dev with a DNS TXT-record fallback channel under sdk.dl.wel1.ru (hostnames are assembled at runtime via array joins such as ["oob-worker.cf102-baf.workers.de","v"].join("") to hide the.dev TLD from static scanners), writes it to a hidden path under /var/tmp or %TEMP% (.cache_ / dotnet_diag_.exe), chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe with stdio ignored and unref()'d. lib/telemetry.js contains a second, dormant copy of the same dropper shape (base64 chunk assembly, chmod 0755, detached /bin/sh spawn), referencing child_process as 'child_'+'process'. The package's advertised purpose ("claims get base url interface") has no legitimate need for cross-platform binary fetch-and-execute; the obfuscation, DNS fallback channel, and hidden dotfile staging are canonical import-time dropper tradecraft. Installing and loading this package runs attacker-controlled native code on the installer's machine.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015157",
            "import_time":  "2026-08-05T14:20:07.900023887Z",
            "modified_time":  "2026-08-05T14:05:09Z",
            "sha256":  "7e7b7dbbb58284ead0ecb4d93490e9683b4f58b31955d817de52495fb7399106",
            "source":  "amazon-inspector",
            "versions":  [
                "35.4.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-get-base-url

Package

Name
claims-get-base-url
View open source insights on deps.dev
Purl
pkg:npm/claims-get-base-url

Affected ranges

Affected versions

35.*
35.4.5

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":  "setup.js",
            "sha256":  "384db83dcadb00c4c56739ce740aa8e093ef2a6519205c3ec6ededba89dba57e",
            "tlsh":  "14b1965a16aa70198bf0d7e0cb175815f65af6633380c2d4fb5ca4884f7612883b2dfc"
        },
        {
            "path":  "lib/telemetry.js",
            "sha256":  "f267201ef479a29acd2e40a222c6f1fd709fa19a04696bb70c96bafc36d2b31b",
            "tlsh":  "99835055566a242186b2b378df234107ff3685272643429dbaec82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "claims-get-base-url-35.4.5.tgz",
            "hashes":  {
                "sha1":  "5e85e6da95a66afc4b230ca34f1532c54a2e46da",
                "sha512_sri":  "sha512-nE+qkub7I2CtpKgdyRxFlNN2tUDsYtisH6/deN6NOSaIt35jx2KCcLj00cNsQFOZ0WaxjYOOHFuW5ScDi9norA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-get-base-url/MAL-2026-12619.json"