Skip to content
Heist/ feed
Unrated

Malicious code in req-throttle-mini (RubyGems)

Type: advisorySource: OSV1 source record

RubyGems runs this gem's native extension script `ext/req_throttle_mini/extconf.rb` during `gem install`. The script exits without action on CI runners and sandboxes, based on CI environment variables, the hostname, the username and the working directory. It continues if the system uptime is over 30 minutes and the home directory holds `.ssh`, `.gitconfig`, `.npmrc`, `.gem/credentials` or `.bundle`. It then decodes a Base64 Ruby payload, forks twice into a detached process, waits 20 to 40 minutes and opens a reverse shell that connects `/bin/sh` to 45.138.12.177 on TCP port 8089. The shell reconnects every 30 seconds. The Ruby code in `lib/` is a decoy. The RubyGems account `reqthrottle_3474` published this gem and 41 others with the same loader on 2026-10-05. --- _-= Per source details. Do not edit below this line.=-_ ## Source: amazon-inspector (91bd1a5cb0c3bacb52c303b598c520dff6f40695affdb1643dd502cf3981d797) The gem's native-extension script extconf.rb base64-decodes an embedded Ruby payload, writes it to a randomized file under the system temp directory, and spawns a detached `ruby` process on it before invoking mkmf's `create_makefile`. The decoded payload opens a TCP connection to the hardcoded bare IP 45.138.12.177 on port 8089 and bridges the socket bidirectionally to `/bin/sh`, giving the remote endpoint interactive command execution on the installing host. The payload loops with a 30-second sleep to re-dial on disconnect, providing persistent reconnection. The C2 d

Announced Source revision 1
Original source ↗

MAL-2026-17568

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: osv:MAL-2026-17568

req-throttle-mini

Source reference: /affected/0/package/name

Affected versions
1.0.0

Source reference: /affected/0/versions

1.0.1

Source reference: /affected/0/versions

Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "ranges": [
      {
        "type": "ECOSYSTEM",
        "events": [
          {
            "introduced": "0"
          }
        ]
      }
    ],
    "package": {
      "name": "req-throttle-mini",
      "purl": "pkg:gem/req-throttle-mini",
      "ecosystem": "RubyGems"
    },
    "versions": [
      "1.0.0",
      "1.0.1"
    ],
    "database_specific": {
      "cwes": [
        {
          "name": "Embedded Malicious Code",
          "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."
        }
      ],
      "source": "https://github.com/ossf/malicious-packages/blob/main/osv/malicious/rubygems/req-throttle-mini/MAL-2026-17568.json",
      "indicators": {
        "evidence_files": [
          {
            "path": "ext/req_throttle_mini/extconf.rb",
            "tlsh": "560170574bc7290e13c186ed2b7d41508c6aceca532516674341c0f5c28c9bacf27cb7",
            "sha256": "c59a984d7c70b63206346c1df7ab3c231bed59c2d01416b3d9063c30d5643cc4"
          }
        ]
      }
    }
  }
]

Publisher severity

No explicit severity was provided.

Event
#85928 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement