New detectors: unexpected netutil calls

2025-02-18 02:17:01 +00:00 · 2023-01-19 11:39:02 -05:00 · 2023-01-19 11:39:02 -05:00 · 2f8cca819b
commit 2f8cca819b
parent 8325325996
2 changed files with 187 additions and 0 deletions
--- a/detection/discovery/unexpected-netutil-calls-linux.sql
+++ b/detection/discovery/unexpected-netutil-calls-linux.sql
@ -0,0 +1,98 @@
+-- Suspicious parenting of fetch tools (event-based)
+--
+-- refs:
+--   * https://attack.mitre.org/techniques/T1016/ (System Network Configuration Discovery)
+--
+-- tags: transient process state often
+-- platform: linux
+-- interval: 900
+SELECT
+  pe.path AS child_path,
+  REGEX_MATCH (pe.path, '.*/(.*)', 1) AS child_name,
+  TRIM(pe.cmdline) AS child_cmd,
+  pe.pid AS child_pid,
+  p.cgroup_path AS child_cgroup,
+  pe.parent AS parent_pid,
+  TRIM(IIF(pp.cmdline != NULL, pp.cmdline, ppe.cmdline)) AS parent_cmd,
+  TRIM(IIF(pp.path != NULL, pp.path, ppe.path)) AS parent_path,
+  IIF(pp.path != NULL, phash.sha256, pehash.sha256) AS parent_hash,
+  REGEX_MATCH (
+    IIF(pp.path != NULL, pp.path, ppe.path),
+    '.*/(.*)',
+    1
+  ) AS parent_name,
+  TRIM(IIF(gp.cmdline != NULL, gp.cmdline, gpe.cmdline)) AS gparent_cmd,
+  TRIM(IIF(gp.path != NULL, gp.path, gpe.path)) AS gparent_path,
+  IIF(gp.path != NULL, gphash.sha256, gpehash.path) AS gparent_hash,
+  REGEX_MATCH (
+    IIF(gp.path != NULL, gp.path, gpe.path),
+    '.*/(.*)',
+    1
+  ) AS gparent_name,
+  IIF(pp.parent != NULL, pp.parent, ppe.parent) AS gparent_pid,
+  CONCAT (
+    REGEX_MATCH (pe.path, '.*/(.*)', 1),
+    ',',
+    MIN(pe.euid, 500),
+    ',',
+    REGEX_MATCH (
+      IIF(pp.path != NULL, pp.path, ppe.path),
+      '.*/(.*)',
+      1
+    ),
+    ',',
+    REGEX_MATCH (
+      IIF(gp.path != NULL, gp.path, gpe.path),
+      '.*/(.*)',
+      1
+    )
+  ) AS exception_key
+FROM
+  process_events pe, uptime
+  LEFT JOIN processes p ON pe.pid = p.pid
+  LEFT JOIN processes pp ON pe.parent = pp.pid
+  LEFT JOIN hash phash ON pp.path = phash.path
+  LEFT JOIN process_events ppe ON pe.parent = ppe.pid
+  LEFT JOIN hash pehash ON ppe.path = pehash.path
+  LEFT JOIN processes gp ON gp.pid = pp.parent
+  LEFT JOIN hash gphash ON gp.path = gphash.path
+  LEFT JOIN process_events gpe ON ppe.parent = gpe.pid
+  LEFT JOIN hash gpehash ON gpe.path = gpehash.path
+WHERE
+  uptime.total_seconds > 30
+  -- NOTE: The remainder of this query is synced with unexpected-fetcher-parents
+  AND pe.path IN (
+    '/usr/bin/ifconfig',
+    '/usr/bin/ip',
+    '/usr/bin/iptables',
+    '/usr/bin/ufw',
+    '/usr/bin/nft',
+    '/bin/ifconfig',
+    '/bin/ip',
+    '/bin/iptables',
+    '/bin/ufw',
+    '/bin/nft',
+    '/sbin/ifconfig',
+    '/sbin/ip',
+    '/sbin/iptables',
+    '/sbin/ufw',
+    '/sbin/nft'
+  )
+  AND pe.time > (strftime('%s', 'now') -900) -- Ignore partial table joins
+  AND NOT (
+    pe.euid > 500
+    AND parent_name IN ('sh', 'fish', 'zsh', 'bash', 'dash')
+    AND gparent_name IN (
+      'alacritty',
+      'gnome-terminal-',
+      'kitty',
+      'login',
+      'roxterm',
+      'tmux',
+      'tmux:server',
+      'wezterm-gui',
+      'zsh'
+    )
+  )
+GROUP BY
+  pe.pid
--- a/detection/discovery/unexpected-netutil-calls-macos.sql
+++ b/detection/discovery/unexpected-netutil-calls-macos.sql
@ -0,0 +1,89 @@
+-- Suspicious parenting of fetch tools (event-based)
+--
+-- refs:
+--   * https://attack.mitre.org/techniques/T1016/ (System Network Configuration Discovery)
+--
+-- tags: transient process state often
+-- platform: linux
+-- interval: 900
+SELECT
+  pe.path AS child_path,
+  REGEX_MATCH (pe.path, '.*/(.*)', 1) AS child_name,
+  TRIM(pe.cmdline) AS child_cmd,
+  pe.pid AS child_pid,
+  p.cgroup_path AS child_cgroup,
+  pe.parent AS parent_pid,
+  TRIM(IIF(pp.cmdline != NULL, pp.cmdline, ppe.cmdline)) AS parent_cmd,
+  TRIM(IIF(pp.path != NULL, pp.path, ppe.path)) AS parent_path,
+  IIF(pp.path != NULL, phash.sha256, pehash.sha256) AS parent_hash,
+  REGEX_MATCH (
+    IIF(pp.path != NULL, pp.path, ppe.path),
+    '.*/(.*)',
+    1
+  ) AS parent_name,
+  TRIM(IIF(gp.cmdline != NULL, gp.cmdline, gpe.cmdline)) AS gparent_cmd,
+  TRIM(IIF(gp.path != NULL, gp.path, gpe.path)) AS gparent_path,
+  IIF(gp.path != NULL, gphash.sha256, gpehash.path) AS gparent_hash,
+  REGEX_MATCH (
+    IIF(gp.path != NULL, gp.path, gpe.path),
+    '.*/(.*)',
+    1
+  ) AS gparent_name,
+  IIF(pp.parent != NULL, pp.parent, ppe.parent) AS gparent_pid,
+  CONCAT (
+    REGEX_MATCH (pe.path, '.*/(.*)', 1),
+    ',',
+    MIN(pe.euid, 500),
+    ',',
+    REGEX_MATCH (
+      IIF(pp.path != NULL, pp.path, ppe.path),
+      '.*/(.*)',
+      1
+    ),
+    ',',
+    REGEX_MATCH (
+      IIF(gp.path != NULL, gp.path, gpe.path),
+      '.*/(.*)',
+      1
+    )
+  ) AS exception_key
+FROM
+  process_events pe, uptime
+  LEFT JOIN processes p ON pe.pid = p.pid
+  LEFT JOIN processes pp ON pe.parent = pp.pid
+  LEFT JOIN hash phash ON pp.path = phash.path
+  LEFT JOIN process_events ppe ON pe.parent = ppe.pid
+  LEFT JOIN hash pehash ON ppe.path = pehash.path
+  LEFT JOIN processes gp ON gp.pid = pp.parent
+  LEFT JOIN hash gphash ON gp.path = gphash.path
+  LEFT JOIN process_events gpe ON ppe.parent = gpe.pid
+  LEFT JOIN hash gpehash ON gpe.path = gpehash.path
+WHERE
+  -- NOTE: The remainder of this query is synced with unexpected-fetcher-parents
+  pe.path IN (
+    '/sbin/ifconfig',
+    '/usr/sbin/netstat',
+    '/sbin/pfctl',
+    '/usr/libexec/ApplicationFirewall/socketfilterfw'
+  )
+  AND uptime.total_seconds > 30
+  AND pe.time > (strftime('%s', 'now') -900) -- Ignore partial table joins
+  AND pe.status == 0
+  AND NOT (
+    pe.euid > 500
+    AND parent_name IN ('sh', 'fish', 'zsh', 'bash', 'dash')
+    AND gparent_name IN (
+      'kitty',
+      'login',
+      'tmux',
+      'ShellLauncher',
+      'tmux:server',
+      'zsh'
+    )
+  )
+  AND exception_key NOT IN (
+    'netstat,0,sh,sudo'
+  )
+  AND parent_cmd NOT IN ('/bin/sh /etc/periodic/daily/420.status-network')
+GROUP BY
+  pe.pid