MAL-2026-12561

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-total/MAL-2026-12561.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12561
Published
2026-08-05T13:20:15Z
Modified
2026-08-17T05:30:11.871597746Z
Summary
Malicious code in checkout-desktop-total (npm)
Details

The package executes a hidden loader when it is imported. The loader downloads and runs a platform-specific native payload from attacker-controlled Cloudflare Workers hosts, or reconstructs the payload from DNS TXT records under wel1.ru if HTTPS delivery fails. Systems that imported this package should be considered compromised; rotate accessible secrets and investigate temporary-file execution and DNS activity to the listed infrastructure.

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

Source: amazon-inspector (4b44040d21c83b93de2969a5a19e4180519e6bf99acc1d39476087a31379cc0b)

On require of index.js, platform.js runs a setup() routine that unconditionally downloads a platform-specific binary from Cloudflare Workers hosts (oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf100-416.workers.dev) with a DNS-TXT fallback channel under *.dl.wel1.ru (c.<domain> returns a chunk count, N.<domain> returns base64 chunks that are concatenated and decoded). Host literals are split into arrays and joined at runtime to evade grep-based scanning. The downloaded bytes are written to a disguised path — '.cache<rand>' under /tmp on Unix, 'dotnetdiag<rand>.exe' under %TEMP% on Windows — chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe /c start /b with windowsHide:true. An on-disk marker '.analytics_state' is written. The package name and its deceptive filenames impersonate benign tooling; there is no legitimate reason for a 'checkout-desktop-total' library entry to fetch and execute an opaque binary from a Cloudflare Workers host on import.

Database specific 
{
    "malicious-packages-origins": [
        {
            "import_time": "2026-08-05T14:20:13.413538675Z",
            "sha256": "4b44040d21c83b93de2969a5a19e4180519e6bf99acc1d39476087a31379cc0b",
            "modified_time": "2026-08-05T14:13:12Z",
            "source": "amazon-inspector",
            "id": "IN-MAL-2026-015213",
            "versions": [
                "35.6.1"
            ]
        }
    ],
    "iocs": {
        "domains": [
            "oob-worker.cf100-416.workers.dev",
            "oob-worker.cf102-baf.workers.dev",
            "oob-worker.cf99-9b3.workers.dev",
            "sdk.dl.wel1.ru",
            "ext.dl.wel1.ru",
            "pkg.dl.wel1.ru",
            "net.dl.wel1.ru"
        ]
    }
}
References
Credits

Affected packages

npm / checkout-desktop-total

Package

Name
checkout-desktop-total
View open source insights on deps.dev
Purl
pkg:npm/checkout-desktop-total

Affected ranges

Affected versions

35.*
35.6.1

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-desktop-total/MAL-2026-12561.json"
indicators 
{
    "evidence_files": [
        {
            "sha256": "07196a0bb804faa4ed7c71162a8f5fabed28dc78228c54821a93c37cb03cea75",
            "path": "_platform.js",
            "tlsh": "44a199ab16a670194bb097e5c7175416f65be66333c0c2c8f75ca5984f7212483b2efc"
        }
    ],
    "package_integrity": [
        {
            "filename": "checkout-desktop-total-35.6.1.tgz",
            "hashes": {
                "sha1": "04ab54c8de4f42d9643a57124731588e994a4fbe",
                "sha512_sri": "sha512-vrYzUc/BcGlBI6QsPo096xFgSljakrdksUxOVrp8J0g2jV9DGKJohhLgsdcwjrkAIPOkR/GNXAZUJopIpCsxnw=="
            }
        }
    ]
}
cwes 
[
    {
        "name": "Embedded Malicious Code",
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature."
    },
    {
        "name": "Embedded Malicious Code",
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506"
    }
]