MAL-2026-17790

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Import Source
https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/mev-sandwich-detect/MAL-2026-17790.json
JSON Data
https://api.osv.dev/v1/vulns/MAL-2026-17790
Published
2026-10-11T13:47:48Z
Modified
2026-10-11T14:30:07Z
Summary
Malicious code in mev-sandwich-detect (RubyGems)
Details

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

Source: amazon-inspector (5d92e0d32c64cdab1627cbfe5bd1d79445d0ff09f4d24336dd9026c02fe46917)

mev-sandwich-detect 0.9.1 is a stub gem whose only functional behavior is install-time code execution. The gemspec declares a native extension, but ext/extconf.rb ships no C/C++ sources and does not build an addon; instead it base64-decodes an embedded Ruby payload and eval()s it inside a double-forked, detached, output-silenced child process during gem install. The decoded payload opens a TCPSocket to the hardcoded host 45.138.12.177 on port 8089 and bridges it to /bin/sh via IO.popen and IO.copy_stream, yielding an interactive shell on the installer's host to the operator of that IP. Execution is gated by anti-analysis checks: the payload exits early if the host appears to be CI, an ephemeral/sandbox VM, a generated analyst username, or running under /tmp or /opt/rubygems analysis paths, and requires uptime over 1800 seconds and the presence of developer-credential artifacts (~/.ssh, ~/.gitconfig, ~/.gem/credentials, ~/.npmrc, ~/.bundle) before dialing out, after sleeping a randomized 20-40 minutes. The lib/ entry point is a 13-line no-op defining only VERSION/build_id/healthy?, and the README is mislabeled as 'bitcoin-rpc-lite'. The native-extension slot exists solely as a lifecycle execution vector for the reverse shell.

Database specific 
{
    "malicious-packages-origins": [
        {
            "id": "IN-MAL-2026-021362",
            "import_time": "2026-10-11T14:17:59.361257767Z",
            "modified_time": "2026-10-11T13:47:48Z",
            "sha256": "5d92e0d32c64cdab1627cbfe5bd1d79445d0ff09f4d24336dd9026c02fe46917",
            "source": "amazon-inspector",
            "versions": [
                "0.9.1"
            ]
        }
    ]
}
References
Credits

Affected packages

RubyGems / mev-sandwich-detect

Package

Name
mev-sandwich-detect
Purl
pkg:gem/mev-sandwich-detect

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/mev_sandwich_detect/extconf.rb",
            "sha256": "10218e975f54a4f11fe3954e1b584a5f05054003bf5773c3c2b8cceaa74ba763",
            "tlsh": "9751775acf8359e55aa1c0c045798012faa3ab0a50646875f3ee0868ff59b26c0f12fe"
        }
    ]
}
source 
"https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/mev-sandwich-detect/MAL-2026-17790.json"