MAL-2026-12655

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/cobrowsing-k8s-module/MAL-2026-12655.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12655
Published
2026-08-05T13:59:01Z
Modified
2026-08-05T14:36:09Z
Summary
Malicious code in cobrowsing-k8s-module (npm)
Details

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

Source: amazon-inspector (6cde47afeee95884dc83b3dab22855db86950fd58756900af5100d1286a7c7be)

On require of the package's main entry, bridge.js selects a platform-specific endpoint, reconstructs remote hostnames at runtime via array.join("") string-split obfuscation (oob-worker.cf100-416.workers.dev, oob-worker.cf102-baf.workers.dev, oob-worker.cf103-070.workers.dev, and sdk/ext/pkg/net.dl.wel1.ru), fetches an opaque binary over HTTPS, writes it to a hidden temp path with cover-story filenames (dotnet_diag.exe,.cache_,.analytics_state), chmods 0755, and spawns it detached via child_process spawn("/bin/sh") or spawn("cmd"). If HTTP fetch fails, the code falls back to a DNS-TXT covert channel that reads a chunk count from c. and reassembles base64-encoded binary chunks across numbered TXT records under *.dl.wel1.ru to bypass HTTP egress filters. No hash or signature verification is performed. The behavior is disguised as analytics/telemetry.

Database specific 
{
    "malicious-packages-origins":  [
        {
            "id":  "IN-MAL-2026-015118",
            "import_time":  "2026-08-05T14:20:03.931852308Z",
            "modified_time":  "2026-08-05T13:59:01Z",
            "sha256":  "6cde47afeee95884dc83b3dab22855db86950fd58756900af5100d1286a7c7be",
            "source":  "amazon-inspector",
            "versions":  [
                "35.6.2"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / cobrowsing-k8s-module

Package

Name
cobrowsing-k8s-module
View open source insights on deps.dev
Purl
pkg:npm/cobrowsing-k8s-module

Affected ranges

Affected versions

35.*
35.6.2

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":  "_bridge.js",
            "sha256":  "d5b1e7a48294fd0e771c24b3d7ed21809ff00e9723592af23145940609c582aa",
            "tlsh":  "5ca1a89a16a670184bb09be4c717541af65be66333c0c298f69ca5d81f7612483b2efc"
        }
    ],
    "package_integrity":  [
        {
            "filename":  "cobrowsing-k8s-module-35.6.2.tgz",
            "hashes":  {
                "sha1":  "8090ebdd7c600da765411a0f0b766e7592a843af",
                "sha512_sri":  "sha512-wutC/1W86qAGTe7tmL1vWc/Gh2BeuGSqLm6To5n91ixtei+Hsai/uB+raJ8mj6uHB3NSI0DqmLK6Ufv8IzkjrQ=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/cobrowsing-k8s-module/MAL-2026-12655.json"