osquery-defense-kit/detection/execution/unexpected-fetcher-parent-events.sql
2023-03-03 07:24:42 -05:00

124 lines
3.7 KiB
SQL

-- Suspicious parenting of fetch tools (event-based)
--
-- refs:
-- * https://attack.mitre.org/techniques/T1105/ (Ingress Tool Transfer)
--
-- tags: transient process state often
-- platform: posix
-- interval: 450
SELECT
-- Child
pe.path AS p0_path,
REGEX_MATCH (pe.path, '.*/(.*)', 1) AS p0_name,
TRIM(pe.cmdline) AS p0_cmd,
pe.cwd AS p0_cwd,
pe.pid AS p0_pid,
p.cgroup_path AS p0_cgroup,
-- Parent
pe.parent AS p1_pid,
p1.cgroup_path AS p1_cgroup,
TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
COALESCE(p1.path, pe1.path) AS p1_path,
COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
-- Grandparent
COALESCE(p1.parent, pe1.parent) AS p2_pid,
COALESCE(p1_p2.cgroup_path, pe1_p2.cgroup_path) AS p2_cgroup,
TRIM(
COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
) AS p2_cmd,
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path) AS p2_path,
COALESCE(
p1_p2_hash.path,
pe1_p2_hash.path,
pe1_pe2_hash.path
) AS p2_hash,
REGEX_MATCH (
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
'.*/(.*)',
1
) AS p2_name,
-- Exception key
REGEX_MATCH (pe.path, '.*/(.*)', 1) || ',' || MIN(pe.euid, 500) || ',' || REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) || ',' || REGEX_MATCH (
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
'.*/(.*)',
1
) AS exception_key
FROM
process_events pe,
uptime
LEFT JOIN processes p ON pe.pid = p.pid
-- Parents (via two paths)
LEFT JOIN processes p1 ON pe.parent = p1.pid
LEFT JOIN hash p_hash1 ON p1.path = p_hash1.path
LEFT JOIN process_events pe1 ON pe.parent = pe1.pid
AND pe1.cmdline != ''
LEFT JOIN hash pe_hash1 ON pe1.path = pe_hash1.path
-- Grandparents (via 3 paths)
LEFT JOIN processes p1_p2 ON p1.parent = p1_p2.pid -- Current grandparent via parent processes
LEFT JOIN processes pe1_p2 ON pe1.parent = pe1_p2.pid -- Current grandparent via parent events
LEFT JOIN process_events pe1_pe2 ON pe1.parent = pe1_p2.pid
AND pe1_pe2.cmdline != '' -- Past grandparent via parent events
LEFT JOIN hash p1_p2_hash ON p1_p2.path = p1_p2_hash.path
LEFT JOIN hash pe1_p2_hash ON pe1_p2.path = pe1_p2_hash.path
LEFT JOIN hash pe1_pe2_hash ON pe1_pe2.path = pe1_pe2_hash.path
WHERE
-- NOTE: The remainder of this query is synced with unexpected-fetcher-parents
pe.cmdline != ''
AND pe.time > (strftime('%s', 'now') -450)
AND p0_name IN ('curl', 'wget', 'ftp', 'tftp')
AND NOT exception_key IN (
'curl,0,nm-dispatcher,',
'curl,0,nm-dispatcher,nm-dispatcher',
'curl,500,bash,nix-daemon',
'curl,500,bash,ShellLauncher',
'curl,500,bash,zsh',
'curl,500,env,env',
'curl,500,fish,gnome-terminal-',
'curl,500,ruby,zsh',
'curl,500,ShellLauncher,',
'curl,500,ShellLauncher,login',
'curl,500,zsh,login',
'curl,500,zsh,sh',
'wget,500,env,env'
)
AND NOT (
pe.euid > 500
AND p1_name IN ('sh', 'fish', 'zsh', 'bash', 'dash')
AND p2_name IN (
'alacritty',
'gnome-terminal-',
'kitty',
'login',
'roxterm',
'tmux',
'tmux:server',
'wezterm-gui',
'zsh'
)
)
AND NOT p1_name IN ('yay', 'nvim')
AND NOT (
pe.euid > 500
AND p0_cmd IN ('curl --fail https://ipinfo.io/timezone')
)
AND NOT (
pe.euid > 500
AND p1_name = 'env'
AND p1_cmd LIKE '/usr/bin/env -i % HOMEBREW_BREW_FILE=%'
)
AND NOT (
pe.euid > 500
AND p1_name = 'ruby'
AND p1_cmd LIKE '%/Homebrew/brew.rb%'
)
AND NOT (
pe.euid > 500
AND p1_name = 'env'
AND p1_cmd LIKE '/usr/bin/env bash ./hack/%.sh'
)
AND NOT p0_cmd LIKE 'wget --no-check-certificate https://github.com/istio/istio/%'
AND NOT p.cgroup_path LIKE '/system.slice/docker-%'
GROUP BY
pe.pid