MAL-2026-12552

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-create-token/MAL-2026-12552.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12552
Published
2026-08-05T14:14:50Z
Modified
2026-08-05T14:35:20Z
Summary
Malicious code in checkout-create-token (npm)
Details

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

Source: amazon-inspector (bf66f90f0fd4a6d5d6478f1b032efc6d9eaf3c2e7d02fe60b566b02ea4a68193)

Package advertises itself as a token-generation library but its main entry index.js silently side-loads platform.js via a try/catch require. On import, platform.js runs an init() that assembles command-and-control hostnames by array-join concatenation (cf99-*.workers.dev, cf9b3/101-adf/102-baf/103-070.workers.dev) with a DNS-TXT fallback under wel1.ru (dnsTxt() enumerates TXT records under c. and reassembles a base64 payload), downloads a platform-specific binary via https.get, writes it to /var/tmp or %TEMP% under decoy names (dotnet_diag*,.cache*,.analytics_state), chmods 0755 on POSIX, and spawns it detached via spawn("/bin/sh", ["-c", fp+" &"]) or cmd.exe /c start. Env-var gates named DISABLE_TELEMETRY/ANALYTICS_OPT_OUT/DO_NOT_TRACK are used as cover to mimic legitimate telemetry. The binary-drop-and-execute behavior is unrelated to the package's advertised token-generation purpose.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-015224",
            "import_time": "2026-08-05T14:20:14.401715492Z",
            "modified_time": "2026-08-05T14:14:50Z",
            "sha256": "bf66f90f0fd4a6d5d6478f1b032efc6d9eaf3c2e7d02fe60b566b02ea4a68193",
            "source": "amazon-inspector",
            "versions": [
                "35.5.6"
            ]
        }
    ]
}
References
Credits

Affected packages

npm / checkout-create-token

Package

Name
checkout-create-token
View open source insights on deps.dev
Purl
pkg:npm/checkout-create-token

Affected ranges

Affected versions

35.*
35.5.6

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": "_platform.js",
            "sha256": "31fd2abc445bcf3f7ce35b3998a3dab303f4908ea685f7dc43877d1d359432e2",
            "tlsh": "5aa1959a166a701887b09be48b175816f65ef6733780c5c4fa5c69d81fb212483b1efc"
        },
        {
            "path": "index.js",
            "sha256": "bd5fbdcb9fcd9ae57452752236d1c2b4230b8ff2373e186b9e9df4c4330b89ec",
            "tlsh": "4601805207f4b129cae853b79f13c003fd15e07626854668774453ee9ef58100366db8"
        }
    ],
    "package_integrity": [
        {
            "filename": "checkout-create-token-35.5.6.tgz",
            "hashes": {
                "sha1": "a6ee3bf4a452bba7a4173f39bb532917cdbc4fe0",
                "sha512_sri": "sha512-ArzmBeWIxm2IcJm2KpCmGhOFHvph52QQDnlLt2ncHf+5pvFw0A4vud+xZBKEHjedUHd3Y3Dm5bv/rfjtADzQQA=="
            }
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/checkout-create-token/MAL-2026-12552.json"