MAL-2026-12636

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-person-domain/MAL-2026-12636.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12636
Published
2026-08-05T14:01:05Z
Modified
2026-08-05T14:36:00.998227078Z
Summary
Malicious code in claims-person-domain (npm)
Details

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

Source: amazon-inspector (03f8408e0f3ee2e4d802003cc54666a1e535bbd512e8515d1ef3b7a63acf16d8)

On require of the package's main entry, index.js loads./support.js which selects a platform-specific asset path (linux/darwin/win32), fetches an opaque binary from one of four Cloudflare Workers endpoints whose hostnames are assembled at runtime by joining fragmented string arrays (oob-worker.cf{99-9b3,101-adf,102-baf,103-070}.workers.dev), with a DNS-TXT covert-channel fallback via {sdk,ext,pkg,net}.dl.wel1.ru. The fetched bytes are written to /var/tmp or %TEMP% under disguised names (.cache<hex>, dotnetdiag<hex>.exe), chmod'd 0755, and spawned detached via /bin/sh -c or cmd.exe. A persistence marker at /tmp/.analyticsstate prevents re-execution. A parallel dropper implementation is bundled in lib/telemetry.js (self-labeled 'Analytics SDK', 81KB) that base64-decodes a payload buffer and spawns it the same way; both files use runtime string concatenation (require("child" + "process"), fs["chmod" + "Sync"]) to evade static analysis. The obfuscation, disguised filenames mimicking diagnostic tooling, DNS-TXT fallback, and dual dropper implementations have no legitimate purpose.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "03f8408e0f3ee2e4d802003cc54666a1e535bbd512e8515d1ef3b7a63acf16d8",
            "id": "IN-MAL-2026-015131",
            "modified_time": "2026-08-05T14:01:05Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T14:20:05.179451117Z",
            "versions": [
                "35.5.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-person-domain

Package

Name
claims-person-domain
View open source insights on deps.dev
Purl
pkg:npm/claims-person-domain

Affected ranges

Affected versions

35.*
35.5.9

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "f973b1831f83e3207e2f3def139b0ea3678f82aa6e78e8347d487afa68035dc4",
            "path": "_support.js",
            "tlsh": "02b1a75a16a630298bb0d7e48617441af66be6633781c2d8f75ca5881fb3524c3b2dfc"
        },
        {
            "sha256": "271ad3b764eaa8ff31992e1dd5777388c85d59c6bf179c0db2b896cc9519086e",
            "path": "lib/telemetry.js",
            "tlsh": "94835056566a142186b2b378df234107ff3685272642429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-Z8Y7YNg2Wzx/rCaZma1Aul5F/cIsdu85U3w5f9m6LV77PPCFc8HOcKO3QucNuTBgFZfQjH4WbRPmahnyfS7fwA==",
                "sha1": "acdd36c902eddeadf534af1b28a3ed883dcf17d9"
            },
            "filename": "claims-person-domain-35.5.9.tgz"
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-person-domain/MAL-2026-12636.json"