Overwritten Memory Map Ddexec Linux

Processes with a memory map that suggests they might be code smuggling.

Description

ODK (osquery-defense-kit) is unique in that the queries are designed to be used as part of a production detection & response pipeline. The detection queries are formulated to return zero rows during normal expected behavior, so that they may be configured to generate alerts when rows are returned.

Query

-- Processes with a memory map that suggests they might be code smuggling.
--
-- references:
--   * https://github.com/arget13/DDexec
--
-- tags: persistent daemon seldom
SELECT
  pmm.path AS mmap_path,
  pmm.start as mmap_start,
  pmm.end AS mmap_end,
  -- Child
  p0.pid AS p0_pid,
  p0.path AS p0_path,
  p0.name AS p0_name,
  p0.cmdline AS p0_cmd,
  p0.cwd AS p0_cwd,
  p0.cgroup_path AS p0_cgroup,
  p0.euid AS p0_euid,
  p0_hash.sha256 AS p0_sha256,
  -- Parent
  p0.parent AS p1_pid,
  p1.path AS p1_path,
  p1.name AS p1_name,
  p1.euid AS p1_euid,
  p1.cmdline AS p1_cmd,
  p1_hash.sha256 AS p1_sha256,
  -- Grandparent
  p1.parent AS p2_pid,
  p2.name AS p2_name,
  p2.path AS p2_path,
  p2.cmdline AS p2_cmd,
  p2_hash.sha256 AS p2_sha256
FROM
  processes p0
  JOIN process_memory_map pmm ON p0.pid = pmm.pid
  LEFT JOIN hash p0_hash ON p0.path = p0_hash.path
  LEFT JOIN processes p1 ON p0.parent = p1.pid
  LEFT JOIN hash p1_hash ON p1.path = p1_hash.path
  LEFT JOIN processes p2 ON p1.parent = p2.pid
  LEFT JOIN hash p2_hash ON p2.path = p2_hash.path
WHERE
  p0.path != ""
  AND pmm.offset = 0
  AND pmm.device = '00:00'
  AND pmm.permissions = 'r--p'
  AND pmm.pseudo = 0
  and pmm.start LIKE '0x0%'
GROUP BY
  p0.pid;

tags: SStagSS

Reference

https://github.com/chainguard-dev/osquery-defense-kit