MAL-2026-13231

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-outgoing-call/MAL-2026-13231.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13231
Published
2026-08-05T15:37:31Z
Modified
2026-08-05T16:50:03Z
Summary
Malicious code in bigops-outgoing-call (npm)
Details

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

Source: amazon-inspector (536ee260eadf72447df4e01eb549a86779846d21b3b9b539b486f2bcd65ba750)

On require of index.js the package loads runtime.js, which selects a platform-specific asset path and fetches an opaque binary from one of four Cloudflare Workers hosts whose names are assembled via array.join("") string-splitting (oob-worker.cf103-070.workers.dev, oob-worker.cf99-9b3.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf100-416.workers.dev), with a DNS TXT covert-channel fallback that reassembles a base64-encoded payload from numbered TXT records under wel1.ru. The fetched bytes are written to /tmp or %TEMP% under disguised names (.cache on Unix, dotnet_diag_.exe on Windows), chmodded 0755, and spawned detached via /bin/sh -c or cmd.exe. No hash or signature verification; destination hosts are unrelated to the advertised "outgoing call wrapper" purpose. The tarball also ships an undeclared ~80 KB lib/telemetry.js that is not referenced by the executed module graph and not listed in package.json files.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015770",
            "import_time": "2026-08-05T16:13:43.267651405Z",
            "modified_time": "2026-08-05T15:37:31Z",
            "sha256": "536ee260eadf72447df4e01eb549a86779846d21b3b9b539b486f2bcd65ba750",
            "source": "amazon-inspector",
            "versions": [
                "35.1.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / bigops-outgoing-call

Package

Name
bigops-outgoing-call
View open source insights on deps.dev
Purl
pkg:npm/bigops-outgoing-call

Affected ranges

Affected versions

35.*
35.1.6

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": "_runtime.js",
            "sha256": "2d76514e66c57e6e7112abff39090e432838acc0ab9fd445fb0ba2080a3bdceb",
            "tlsh": "76a1766a01a670084bb0e7e5c71b4819f55bf663378182d4fb6c65945f76124c3b2efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "36d8eb92afd95b367ba9a65e5b3c62a4f2559b344f998227c509d5ae9f83354e",
            "tlsh": "7c835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "filename": "bigops-outgoing-call-35.1.6.tgz",
            "hashes": {
                "sha1": "b7e6eb07173512be0396a2279ae9d0d8c9c8f37f",
                "sha512_sri": "sha512-UA3VrDF0enxOFLRgxrXbI0TWxITXSta2rwtCHmLNK6NzLaviRiXUAZ8OggcUoE72tzcpxX5pF49L3ZlbUqsndw=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-outgoing-call/MAL-2026-13231.json"