MAL-2026-12157

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-chats/MAL-2026-12157.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12157
Published
2026-08-05T08:45:15Z
Modified
2026-08-05T10:05:57.661961489Z
Summary
Malicious code in bigops-chats (npm)
Details

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

Source: amazon-inspector (322310cb37baed38193c12087a25e40901a781467fc070c1bf078293ca8586be)

On require() of bigops-chats, index.js loads helpers.js which assembles C2 hostnames via array split-join obfuscation (oob-worker.cf101-adf.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf99-9b3.workers.dev, with a DNS-TXT fallback under sdk.dl.wel1.ru), fetches a platform-specific binary from those hosts without hash or signature verification, writes it to /var/tmp/.cache<hex> on Unix or %TEMP%\dotnetdiag<hex>.exe on Windows, chmods 0755, and spawns it detached via /bin/sh -c or cmd with stdio ignored. A stamp file at /tmp/.analytics_state suppresses re-runs. The staged filename mimics dotnet diagnostic tooling and the behavior is framed as analytics with an env-var opt-out. Hostnames are not publisher-controlled infrastructure and the delivered bytes are opaque and unverifiable.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "322310cb37baed38193c12087a25e40901a781467fc070c1bf078293ca8586be",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T09:28:06.895173041Z",
            "modified_time": "2026-08-05T08:45:15Z",
            "versions": [
                "35.9.6"
            ],
            "id": "IN-MAL-2026-014403"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-chats

Package

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

Affected ranges

Affected versions

35.*
35.9.6

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha1": "dcab52a5f2fb28e698654642b999b64d8fb89664",
                "sha512_sri": "sha512-7f6w9bxt0hSIeXXwqgqHaiRjHwTrBSPF5TtXGw9E3AqIKjmC6eDqyipag3hHBhh/kr0sRbkJxRkmDEjtNind3Q=="
            },
            "filename": "bigops-chats-35.9.6.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_helpers.js",
            "sha256": "5d600e417520560be0f5617c6fb305db5894bab224b264eb120f640a5eae4a35",
            "tlsh": "fda1779a166670188bb0d7e8c7274816f65bf6633780c2c4fb6ca5980f761248372efc"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-chats/MAL-2026-12157.json"