osquery-defense-kit/detection/evasion/parent-missing-from-disk.sql

-- Parent PID is not on disk
-- Reveals boopkit if a child is spawned
-- TODO: Make mount namespace aware
SELECT
  p.name AS child_name,
  p.pid AS child_pid,
  p.path AS child_path,
  p.cmdline AS child_cmd,
  p.uid AS child_uid,
  p.gid AS child_gid,
  hash.path,
  p.on_disk AS child_on_disk,
  pp.pid AS parent_pid,
  pp.name AS parent_name,
  pp.path AS parent_path,
  pp.cmdline AS cmd,
  pp.on_disk AS parent_on_disk,
  pp.uid AS parent_uid,
  pp.gid AS parent_gid
FROM
  processes p
  JOIN processes pp ON pp.pid = p.parent
  LEFT JOIN hash ON p.path = hash.path
WHERE
  parent_on_disk != 1
  AND child_on_disk = 1
  AND NOT child_pid IN (1, 2)
  AND NOT parent_pid IN (1, 2) -- launchd, kthreadd
  AND NOT parent_path IN (
    "/opt/google/chrome/chrome",
    "/usr/bin/gnome-shell"
  ) -- long-running launchers
  AND NOT parent_name IN (
    "lightdm",
    "nvim",
    "gnome-shell",
    "slack",
    "kube-proxy",
    "kubelet"
  ) -- These alerts were unfortunately useless - lots of spam on macOS
  AND NOT (
    parent_path = ""
    AND p.uid > 500
  )
  AND parent_path NOT LIKE "/app/extra/%"
  AND parent_path NOT LIKE "/opt/homebrew/Cellar/%"
  AND NOT (
    parent_name LIKE "kworker/%+events_unbound"
    AND child_name IN ("modprobe")
  )