MAL-2026-12839

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/bigops-tcrm-permissions/MAL-2026-12839.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12839
Published
2026-08-05T15:01:52Z
Modified
2026-08-05T22:19:50.670305707Z
Summary
Malicious code in bigops-tcrm-permissions (npm)
Details

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

Source: amazon-inspector (a20b19aa6d3666cf99d03011aefd683f0d560b45dac6f27c2915dd68dd95bc0d)

On require of bigops-tcrm-permissions, index.js loads runtime.js which fetches a platform-specific binary from hardcoded Cloudflare Workers hosts (oob-worker.cf101-adf.workers.dev, oob-worker.cf103-070.workers.dev, oob-worker.cf102-baf.workers.dev) with a DNS-TXT base64 fallback via sdk.dl.wel1.ru, ext.dl.wel1.ru, pkg.dl.wel1.ru, and net.dl.wel1.ru, writes the bytes to /var/tmp or %TEMP% under a hidden/decoy name, chmods the file 0755, and spawns it detached via /bin/sh -c or cmd. No hash or signature verification is performed, and the destinations are not associated with the package publisher. Destination hostnames and dangerous API names (require("child"+"process"), fs["chmod"+"Sync"]) are reassembled at runtime from string fragments to evade static matching. lib/telemetry.js contains a duplicate dropper flow (base64-assembled chunks, write, chmod 755, spawn /bin/sh detached) under an 'Analytics SDK' cover story, providing a second execution path against the same C2 infrastructure. The advertised purpose is a permissions SDK; dropping and executing native binaries from unrelated infrastructure is inconsistent with that purpose.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "a20b19aa6d3666cf99d03011aefd683f0d560b45dac6f27c2915dd68dd95bc0d",
            "source": "amazon-inspector",
            "versions": [
                "35.5.1"
            ],
            "import_time": "2026-08-05T15:19:56.855133183Z",
            "modified_time": "2026-08-05T15:01:52Z",
            "id": "IN-MAL-2026-015540"
        },
        {
            "sha256": "8ed0adaa078f72d10e3e479f54d4f71f5cb9b7a1f78c0007305c505cb8dc074d",
            "source": "amazon-inspector",
            "import_time": "2026-08-05T21:31:20.547869464Z",
            "modified_time": "2026-08-05T21:02:56Z",
            "versions": [
                "35.6.1"
            ],
            "id": "IN-MAL-2026-015888"
        }
    ]
}
References
Credits

Affected packages

npm / bigops-tcrm-permissions

Package

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

Affected ranges

Affected versions

35.*
35.5.1
35.6.1

Database specific

indicators 
{
    "package_integrity": [
        {
            "hashes": {
                "sha1": "1b43c056ee9952c53dec29520fafbb148c6e81ef",
                "sha512_sri": "sha512-fkEmMKu2lzM2rtEpsZYO5TbYyC5iY81Lta4pRU0y7DGJHssNDl1jdp9WAKmbtEgtLbF53hw2/jNdFssZ/oDNvg=="
            },
            "filename": "bigops-tcrm-permissions-35.5.1.tgz"
        }
    ],
    "evidence_files": [
        {
            "path": "_runtime.js",
            "sha256": "c024a07ce07e2ba1ef84b11fc02d18adf3ef3b2ca53ca228faaf0b9678e24abf",
            "tlsh": "b4a1c69a156670198bb0e7e4c717581af65bf6633380c688fb9c65881f7252483b1efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "8b9db669fed99ca42598f32325243161553524995147d358e7c3d1eb80d286d6",
            "tlsh": "88835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    },
    {
        "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-tcrm-permissions/MAL-2026-12839.json"