Unexpected Packet Sniffer

Find unexpected use of raw sockets in executables, sometimes used for C&C communications

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

-- Find unexpected use of raw sockets in executables, sometimes used for C&C communications
--
-- false positives:
--   * operating-system network managers
--
-- tags: transient process state
-- platform: posix
SELECT
  pop.*,
  -- 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.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
  process_open_sockets pop
  LEFT JOIN processes p0 ON pop.pid = p0.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
  pop.family = 17 -- PF_PACKET
  AND p0.name NOT IN (
    'dhclient',
    'dhcpcd',
    'NetworkManager',
    'packetbeat',
    'systemd-network',
    'tailscaled',
    'tcpdump',
    'wpa_supplicant'
  )
  AND NOT (
    p0.cgroup_path LIKE '/system.slice/docker-%'
    AND p0.path = '/speaker'
    AND p0.name = 'speaker'
    AND protocol = 2054
  )

tags: SStagSS

Reference

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