MAL-2026-13531

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/damir-cbr-dawdntrnssbf/MAL-2026-13531.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-13531
Published
2026-08-07T12:29:07Z
Modified
2026-08-07T13:20:17.519499770Z
Summary
Malicious code in damir-cbr-dawdntrnssbf (npm)
Details

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

Source: amazon-inspector (b201b86e8198a519343eebfaa548af8848dcad42b507826b052f5c97fbcfa90f)

On require() of the package, polyfill.js downloads a platform-specific binary from attacker-controlled Cloudflare Workers hosts (oob-worker.cf10x-*.workers.dev) with a DNS TXT-record chunked-base64 fallback channel via *.dl.wel1.ru, writes the binary to a hidden path (/tmp/.cache<hex> on Unix, %TEMP%\dotnetdiag<hex>.exe on Windows), chmods it 0755, and spawns it detached through /bin/sh or cmd.exe. The C2 hostnames are reconstructed at runtime by joining split string fragments to evade static detection, and the DNS-TXT fallback provides a covert transport when HTTPS egress is blocked. The behavior is framed as 'telemetry/analytics'. The fetched bytes are opaque, unversioned, and unpinned by hash, and originate from non-publisher infrastructure.

Database specific 
{
    "malicious-packages-origins": [
        {
            "sha256": "b201b86e8198a519343eebfaa548af8848dcad42b507826b052f5c97fbcfa90f",
            "source": "amazon-inspector",
            "modified_time": "2026-08-07T12:29:07Z",
            "import_time": "2026-08-07T12:51:21.64427696Z",
            "versions": [
                "35.8.1"
            ],
            "id": "IN-MAL-2026-017000"
        }
    ]
}
References
Credits

Affected packages

npm / damir-cbr-dawdntrnssbf

Package

Name
damir-cbr-dawdntrnssbf
View open source insights on deps.dev
Purl
pkg:npm/damir-cbr-dawdntrnssbf

Affected ranges

Affected versions

35.*
35.8.1

Database specific

source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/npm/damir-cbr-dawdntrnssbf/MAL-2026-13531.json"
indicators 
{
    "evidence_files": [
        {
            "path": "_polyfill.js",
            "sha256": "efca0950f6685a9c4b48c9a01a083bc19346218d18176c82ac243cf086a6204b",
            "tlsh": "4ca1a75919fa70140392f1d8851b681a719bf65332c4e9c8fb8c66984fd7269c3f39ec"
        }
    ],
    "package_integrity": [
        {
            "hashes": {
                "sha512_sri": "sha512-BUtHoT/7ZMHfqYxVRHIGbnb6G1GeSlSNVKyt6sLNHTT+BoVsXX+0jmptzFmydyHe7UlKeUMw/lzjSxjHQ+Fg/A==",
                "sha1": "d953473cc8379f05cfbc29896005687572dd0f2e"
            },
            "filename": "damir-cbr-dawdntrnssbf-35.8.1.tgz"
        }
    ]
}
cwes 
[
    {
        "description": "The product contains code that appears to be malicious in nature.",
        "cweId": "CWE-506",
        "name": "Embedded Malicious Code"
    }
]