MAL-2026-12638

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-policies-domain/MAL-2026-12638.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12638
Published
2026-08-05T14:00:51Z
Modified
2026-08-05T14:36:01Z
Summary
Malicious code in claims-policies-domain (npm)
Details

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

Source: amazon-inspector (5858353e2874492da6b051be8fa2e6061317bc0ac825838f13c6a1b2471c90b5)

claims-policies-domain@35.3.3 executes a binary dropper on module load. index.js requires./platform, which selects a platform-specific path, fetches a binary from one of three hardcoded Cloudflare Workers endpoints (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev) with a DNS TXT fallback channel under *.dl.wel1.ru, writes the bytes to /var/tmp/.cache on Unix or %TEMP%\dotnet_diag_.exe on Windows, chmods the file to 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. No hash or signature verification is performed. Destination hostnames and sensitive API names (child_process, chmodSync, hostname) are assembled at runtime from split string fragments to defeat static analysis (e.g. ["oob-worker.cf102-baf.wo","rkers.","dev"].join(""), require("child_" + "process")). The dropped filename mimics a.NET diagnostic tool on Windows and a hidden dotfile on Unix, and a cooldown marker is written as.analytics_state. The package's advertised purpose as a lightweight claims-policies wrapper does not require fetching or executing a native binary from anonymous worker hosts.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015129",
            "import_time":  "2026-08-05T14:20:05.007814399Z",
            "modified_time":  "2026-08-05T14:00:51Z",
            "sha256":  "5858353e2874492da6b051be8fa2e6061317bc0ac825838f13c6a1b2471c90b5",
            "source":  "amazon-inspector",
            "versions":  [
                "35.3.3"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-policies-domain

Package

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

Affected ranges

Affected versions

35.*
35.3.3

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":  "_platform.js",
            "sha256":  "e9e85fd503f53f32394b9c38e27c8e1c74e2d72844e0f604dbee35f87486c667",
            "tlsh":  "66a1979a16a670184b709be4c6275416f65be2633380c2d4fb5ca9981fb35348372efc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "claims-policies-domain-35.3.3.tgz",
            "hashes":  {
                "sha1":  "6c5e1556bee0937b9563db36f0df35e80f694f1d",
                "sha512_sri":  "sha512-J9BIntvZArruRTBCIKOjT21ypPw+VYCyK6fvyqzyAwsCvoGajyqXNutWTwD/b9GCzmwt4yRlO+2BXfUpldsAyQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-policies-domain/MAL-2026-12638.json"