MAL-2026-13005

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-mobile-bnpl-shopping-banner/MAL-2026-13005.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13005
Published
2026-08-05T14:40:00Z
Modified
2026-08-05T15:51:38Z
Summary
Malicious code in bnpl-blocks-mobile-bnpl-shopping-banner (npm)
Details

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

Source: amazon-inspector (a04004bb44c701e1976ef3d6678efb4cd9668d5a4986937c62928d1345550a86)

On require() of this package, index.js loads polyfill.js which selects a platform-specific download URL, reconstructs hostnames via array.join string-splitting to evade static analysis (resolving to oob-worker.cf101-adf.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf103-070.workers.dev, with a DNS-TXT fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, net.dl.wel1.ru), fetches a native binary, writes it to a disguised filename under /var/tmp or %TEMP% (e.g..cache, dotnet_diag_.exe) mimicking dotnet diagnostic files, chmods 0755, and spawns it detached via /bin/sh -c or cmd.exe with stdio ignored and unref(). Execution is gated by opt-out environment variables and a time-based cache flag file. The package advertises itself as a BNPL shopping banner / platform adapter and has no legitimate reason to fetch and execute a native binary at import time. The hostname obfuscation, disguised temp filenames, DNS-TXT dead-drop fallback, and detached background execution are characteristic malicious dropper behavior.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015392",
            "import_time":  "2026-08-05T15:19:48.908967018Z",
            "modified_time":  "2026-08-05T14:40:00Z",
            "sha256":  "a04004bb44c701e1976ef3d6678efb4cd9668d5a4986937c62928d1345550a86",
            "source":  "amazon-inspector",
            "versions":  [
                "35.1.4"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bnpl-blocks-mobile-bnpl-shopping-banner

Package

Name
bnpl-blocks-mobile-bnpl-shopping-banner
View open source insights on deps.dev
Purl
pkg:npm/bnpl-blocks-mobile-bnpl-shopping-banner

Affected ranges

Affected versions

35.*
35.1.4

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":  "_polyfill.js",
            "sha256":  "a7cb30ccc0993f923cff8e61c1aaae05f079028e57b9ccdd87e2cd22f2774b07",
            "tlsh":  "13a1b799166a70298bb0abf4c717441af65be66333c1c288fb5c99981f7311483b2dfc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "bnpl-blocks-mobile-bnpl-shopping-banner-35.1.4.tgz",
            "hashes":  {
                "sha1":  "a147c01fc11a5dc0b226edce8afe737f8364990a",
                "sha512_sri":  "sha512-NSBtTpvqnBMQQNzn+2kKXvOAgHPwQXEkqbuQie9kGnXPe4ECZpYaTf/rizQM7tuiGDYhQAP9AHcqkcR2SybbXQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bnpl-blocks-mobile-bnpl-shopping-banner/MAL-2026-13005.json"