MAL-2026-12631

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-patch-url/MAL-2026-12631.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12631
Published
2026-08-05T14:02:33Z
Modified
2026-08-05T14:35:58Z
Summary
Malicious code in claims-patch-url (npm)
Details

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

Source: amazon-inspector (c07292652ca72654d945a2833f8cf8915ea79f1ce665a0445938ff2605394c08)

claims-patch-url@35.3.9 presents an empty ClaimsPatchUrl shell class in index.js and unconditionally requires./compat.js on load. On require(), compat.js selects a platform-specific endpoint, downloads an opaque binary from one of four split-concatenated Cloudflare Worker hosts (oob-worker.cf100-.workers.dev through oob-worker.cf103-.workers.dev) with a DNS-TXT resolveTxt covert-channel fallback under *.dl.wel1.ru, writes the payload to /var/tmp or TEMP under cover-story filenames (dotnet_diag.exe,.cache,.analytics_state), chmods it 0755, and spawns it detached via /bin/sh -c or cmd. C2 hostnames are reassembled at runtime via array-join to evade static analysis, and DISABLE_TELEMETRY / DO_NOT_TRACK env checks are used as benign-looking gates. The package's declared API is an empty class; the only functional path is the dropper. Package identity (generic 'Claims patch url runtime support module' description, no dependencies, unused 81KB lib/telemetry.js sibling) is consistent with a typosquat/decoy.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015140",
            "import_time":  "2026-08-05T14:20:06.142964232Z",
            "modified_time":  "2026-08-05T14:02:33Z",
            "sha256":  "c07292652ca72654d945a2833f8cf8915ea79f1ce665a0445938ff2605394c08",
            "source":  "amazon-inspector",
            "versions":  [
                "35.3.9"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / claims-patch-url

Package

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

Affected ranges

Affected versions

35.*
35.3.9

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":  "_compat.js",
            "sha256":  "5999dd0bae285044b2dda796844c43d2e14565802ce91e0d53ba74d82d187a62",
            "tlsh":  "5aa1869a15aa70188770dbe487275416f55bf6633380c284f79ca9984fb71288371efc"
        },
        {
            "path":  "index.js",
            "sha256":  "9cf34353320aa79af63dc0ee93d67bd54d94240a0337ff5b3a723c9488221a45",
            "tlsh":  "82f0509925deb463c6b0f3f7de720052f55388214b5b019479c950ef0fb0914029debe"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "claims-patch-url-35.3.9.tgz",
            "hashes":  {
                "sha1":  "db4c92b610e9b8c44816d63ca0f68751b3035d6c",
                "sha512_sri":  "sha512-l8HFs3VSbqfUuaHCZq0YBVFkmBWsHN9U7M3Y/RuXzD+0xIgGBFrVE+HmUN+luWgvD3zSCJWbRaZyiWPJNuPkyg=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/claims-patch-url/MAL-2026-12631.json"