MAL-2026-13088

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-test-block/MAL-2026-13088.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13088
Published
2026-08-05T14:25:07Z
Modified
2026-08-05T15:52:18.067630193Z
Summary
Malicious code in boxy-test-block (npm)
Details

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

Source: amazon-inspector (a2ce2597c942a6017ba1aad05cadffba71e6673f8ae9298ef589493e3c4e5ad3)

On require('boxy-test-block'), index.js loads compat.js which reconstructs attacker-controlled destination hosts via string-split obfuscation (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev, with DNS-TXT chunked fallback via sdk.dl.wel1.ru / ext.dl.wel1.ru / pkg.dl.wel1.ru / net.dl.wel1.ru), fetches an opaque platform-specific binary over HTTPS, writes it to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnetdiag<hex>.exe on Windows, sets mode 0755 via fs['chmod'+'Sync'], and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Dangerous APIs are hidden with concatenation (require('child_'+'process'), fs['chmod'+'Sync']) to evade static scanners. A second dropper implementation using the same toolkit (base64 chunk decoder, HTTPS + DNS-TXT service discovery, chmod 0755, spawn '/bin/sh -c filePath &') is bundled in lib/telemetry.js. The %TEMP%\dotnetdiag*.exe and /var/tmp/.cache_* staging names are cover for persistence.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "a2ce2597c942a6017ba1aad05cadffba71e6673f8ae9298ef589493e3c4e5ad3",
            "id": "IN-MAL-2026-015292",
            "modified_time": "2026-08-05T14:25:07Z",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T15:19:43.022508439Z",
            "versions": [
                "35.9.5"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-test-block

Package

Name
boxy-test-block
View open source insights on deps.dev
Purl
pkg:npm/boxy-test-block

Affected ranges

Affected versions

35.*
35.9.5

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "abbdf8deadbf4be8971891217fc1ecf8eca34ff8abc333f55edbb0118f6611da",
            "path": "_compat.js",
            "tlsh": "0ea1b79a06b670098b709be0c7275416f65bf6633680d194f7aca9884fb6134c372dfc"
        },
        {
            "sha256": "37b659b5a23286e4528b1a34ea8fa4494c9ed9acda60d458e836aeaffd94beb3",
            "path": "lib/telemetry.js",
            "tlsh": "d0835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-WgL8YG2PxOyqzdd6xpxNGPudH+f8G2hDf1rslzwXIXqqc82779kZRu+XvCGNsmuxPdtNKqJcbHdhgRhnE6ercA==",
                "sha1": "b5c25cb80503f77051fd44f0289f2100dfd1d216"
            },
            "filename": "boxy-test-block-35.9.5.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/boxy-test-block/MAL-2026-13088.json"