MAL-2026-13028

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/boxy-adapter-tramvai/MAL-2026-13028.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13028
Published
2026-08-05T14:33:54Z
Modified
2026-08-05T15:51:49.392946395Z
Summary
Malicious code in boxy-adapter-tramvai (npm)
Details

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

Source: amazon-inspector (d20d5167abc8703b7b09a0d9698e6d0fd060f4378dfa11ab469af3e6805cfc8e)

On library load, index.js requires./runtime.js, which selects a platform-specific staging path, fetches an opaque binary from obfuscated Cloudflare Workers hosts (oob-worker.cf100-416.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev), with a DNS-TXT base64 fallback under *.dl.wel1.ru (sdk/ext/pkg/net subdomains), writes the bytes to /var/tmp/.cache<hex> or %TEMP%\dotnetdiag<hex>.exe, chmods 0755, and detached-spawns via /bin/sh -c or cmd. Hostnames are reconstructed at runtime via Array.join fragments to evade static analysis; a cache marker file at /tmp/.analyticsstate gates re-execution, and env vars named DISABLETELEMETRY/ANALYTICSOPTOUT/DONOTTRACK are used as a telemetry cover story. The DNS-TXT channel reads a chunk count from c.<domain> then reassembles base64 fragments from 0.<domain>..N.<domain> into an executable buffer, providing a firewall-evading secondary delivery path. Payload bytes are unpinned, unverified, and staged under filenames impersonating OS diagnostic tools. The name mimics the legitimate @tramvai ecosystem.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "d20d5167abc8703b7b09a0d9698e6d0fd060f4378dfa11ab469af3e6805cfc8e",
            "id": "IN-MAL-2026-015351",
            "modified_time": "2026-08-05T14:33:54Z",
            "import_time": "2026-08-05T15:19:46.489148927Z",
            "source": "amazon-inspector",
            "versions": [
                "35.6.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / boxy-adapter-tramvai

Package

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

Affected ranges

Affected versions

35.*
35.6.6

Database specific

indicators 
{
    "evidence_files": [
        {
            "sha256": "860e8ca4e8dc97c1d9368937d9919299196c8fe1778103a0fabb8a540fda9688",
            "path": "_runtime.js",
            "tlsh": "d5a1989a16a670194bb09bf4c6174816f65bf6a37380c2c4fb5c69984f7352483b2efc"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-JgRwPS79Xjh9Aa1mc1suOeFhSomQnazuyqsHuAoz1kWHFT7IGyaqiFbimVaav+GDyC7VKlpXy44ngwDF21zr4Q==",
                "sha1": "d30ddc11055c8b40864a5ba78e5e66394f7ef3a8"
            },
            "filename": "boxy-adapter-tramvai-35.6.6.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-adapter-tramvai/MAL-2026-13028.json"