MAL-2026-17800

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/wallet-hd-derive/MAL-2026-17800.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17800
Published
2026-10-11T13:47:58Z
Modified
2026-10-11T14:30:09Z
Summary
Malicious code in wallet-hd-derive (RubyGems)
Details

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

Source: amazon-inspector (fdfb31a6866dee961d55ad503da9de33a2cf743b52c80862e4380519ad5bef12)

The gem is published as a crypto wallet utility but ships no native source; its gemspec declares extconf.rb as an extension so that gem install auto-executes it. extconf.rb decodes a base64-encoded Ruby payload and, after checking for sandbox and analysis signals (CI env, ephemeral hostnames, generated usernames matching patterns such as uA\d+/sandbox/tester/analys/scanner, cwd under /tmp, /opt/rubygems, /workspace, low machine uptime) and confirming developer-identifying files (~/.ssh, ~/.gem/credentials, etc.), double-forks a detached process via fork + Process.setsid, sleeps for 20–40 minutes, then opens a TCP connection to 45.138.12.177:8089 and pipes /bin/sh in both directions using TCPSocket and IO.popen/IO.copy_stream. The shipped library at lib/wallet_hd_derive.rb exposes only two no-op methods (build_id='ok', healthy?=true) and the README is branded for an unrelated package (bitcoin-rpc-lite), confirming the gem exists solely as a delivery vehicle for the install-time backdoor. The destination IP, base64 encoding of the payload, sandbox-evasion gating, and delayed reverse-shell establishment give a remote operator interactive /bin/sh on any developer or CI host that installs the gem.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-021363",
            "import_time": "2026-10-11T14:17:59.436369913Z",
            "modified_time": "2026-10-11T13:47:58Z",
            "sha256": "fdfb31a6866dee961d55ad503da9de33a2cf743b52c80862e4380519ad5bef12",
            "source": "amazon-inspector",
            "versions": [
                "0.9.1"
            ]
        }
    ]
}
References
Credits

Affected packages

RubyGems / wallet-hd-derive

Package

Name
wallet-hd-derive
Purl
pkg:gem/wallet-hd-derive

Affected ranges

Affected versions

0.*
0.9.1

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": "ext/wallet_hd_derive/extconf.rb",
            "sha256": "10218e975f54a4f11fe3954e1b584a5f05054003bf5773c3c2b8cceaa74ba763",
            "tlsh": "9751775acf8359e55aa1c0c045798012faa3ab0a50646875f3ee0868ff59b26c0f12fe"
        },
        {
            "path": "metadata.yaml",
            "sha256": "639cb5f77c70768369244c0d5b86590757eb2974587d812c5eecd673758acb18",
            "tlsh": "0311dd80eb83f43af405d3db98412ba3b373d60cfea53910cae78292438446d6b53122"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/wallet-hd-derive/MAL-2026-17800.json"