MAL-2026-12266

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-leasing.admin.events/MAL-2026-12266.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-12266
Aliases
  • GHSA-pwcq-5xh6-9383
Published
2026-08-05T09:03:52Z
Modified
2026-08-26T01:16:21Z
Summary
Malicious code in tinkoff-statist-browser-typed-client-leasing.admin.events (npm)
Details

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

Source: amazon-inspector (3c5bfe643ac3fad66a9484db8ea78c195b19f385df1c68e39b4d4181f329f7d4)

The package's main entry index.js require()s helpers.js, whose top-level bootstrap runs on load. It detects platform and architecture, fetches a native binary from one of several string-split-obfuscated hosts under *.workers.dev (with a DNS-TXT base64 fallback via *.well1.site subdomains), writes the payload to a disguised path such as /var/tmp/.cache or %TEMP%/dotnet_diag_.exe, chmods it 0755, and spawns it detached via /bin/sh -c or cmd.exe /c start /b. Hostnames and the child_process require target are assembled from array.join fragments to evade string scanning, and a stamp-file check skips re-execution on subsequent installs. A second parallel dropper implementation is bundled as lib/telemetry.js (~81KB) using the same transport, DNS failover, chmod 755, and /bin/sh -c spawn pattern. The package name is a typosquat of an internal Tinkoff namespace with no legitimate purpose visible in the tarball.

Source: ghsa-malware (1264183b2b26b99309d4ab0dd7f7b26336b13961d6bf11d170b60a30be61009c)

Any computer that has this package installed or running should be considered fully compromised. All secrets and keys stored on that computer should be rotated immediately from a different computer. The package should be removed, but as full control of the computer may have been given to an outside entity, there is no guarantee that removing the package will remove all malicious software resulting from installing it.

Database specific
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-014529",
            "import_time": "2026-08-05T09:28:22.467915257Z",
            "modified_time": "2026-08-05T09:03:52Z",
            "sha256": "3c5bfe643ac3fad66a9484db8ea78c195b19f385df1c68e39b4d4181f329f7d4",
            "source": "amazon-inspector",
            "versions": [
                "20.7.7"
            ]
        },
        {
            "id": "GHSA-pwcq-5xh6-9383",
            "import_time": "2026-08-25T16:26:05.051863829Z",
            "modified_time": "2026-08-25T16:05:23Z",
            "ranges": [
                {
                    "events": [
                        {
                            "introduced": "0"
                        }
                    ],
                    "type": "SEMVER"
                }
            ],
            "sha256": "1264183b2b26b99309d4ab0dd7f7b26336b13961d6bf11d170b60a30be61009c",
            "source": "ghsa-malware"
        }
    ]
}
References
Credits

Affected packages

npm / tinkoff-statist-browser-typed-client-leasing.admin.events

Package

Name
tinkoff-statist-browser-typed-client-leasing.admin.events
View open source insights on deps.dev
Purl
pkg:npm/tinkoff-statist-browser-typed-client-leasing.admin.events

Affected ranges

Type
SEMVER
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

20.*
20.7.7

Database specific

cwes
[
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    },
    {
        "cweId": "CWE-506",
        "description": "The product contains code that appears to be malicious in nature.",
        "name": "Embedded Malicious Code"
    }
]
indicators
{
    "evidence_files": [
        {
            "path": "_helpers.js",
            "sha256": "9ca28d11dad866b601c2e2dd6e821dd3ad0a3bb11d16b513f5d653e7b7a552cb",
            "tlsh": "c1a1846a02a6301987b0ebe4cb175416f657f26373809294f79ca5885ff212482f3efc"
        },
        {
            "path": "lib/telemetry.js",
            "sha256": "82ee3e2cd5bf0cacdfbbec15dac1ff69eade029b35f1cc97d58ead4bc19d7e08",
            "tlsh": "eb835055566a242186b2b368df234107ff3685272643429dbafc82dc1fbd72092a5ffc"
        }
    ],
    "package_integrity": [
        {
            "filename": "tinkoff-statist-browser-typed-client-leasing.admin.events-20.7.7.tgz",
            "hashes": {
                "sha1": "a230cdda5fd8adce6a7c46fe9e5562b0cc438a32",
                "sha512_sri": "sha512-4fbeXow2iRhxwxQhe3NySwAypFXhXJmjm6XA5pZxjvTm97G21ljxKiXq2Sh2h1l/nxBcF+FBu8J6JxcOyCh2MQ=="
            }
        }
    ]
}
source
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/tinkoff-statist-browser-typed-client-leasing.admin.events/MAL-2026-12266.json"