115 lines
4.1 KiB
SQL
115 lines
4.1 KiB
SQL
-- Suspicious calls to systemctl(event-based)
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--
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-- refs:
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-- * https://attack.mitre.org/techniques/T1543/002/ (Create or Modify System Process: Systemd Service)
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--
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-- tags: transient process state often
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-- platform: linux
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-- interval: 300
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SELECT
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-- Child
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pe.path AS p0_path,
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REGEX_MATCH (pe.path, '.*/(.*)', 1) AS p0_name,
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TRIM(pe.cmdline) AS p0_cmd,
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pe.cwd AS p0_cwd,
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pe.pid AS p0_pid,
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p.cgroup_path AS p0_cgroup,
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-- Parent
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pe.parent AS p1_pid,
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p1.cgroup_path AS p1_cgroup,
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TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
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COALESCE(p1.path, pe1.path) AS p1_path,
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COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
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REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
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-- Grandparent
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COALESCE(p1.parent, pe1.parent) AS p2_pid,
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COALESCE(p1_p2.cgroup_path, pe1_p2.cgroup_path) AS p2_cgroup,
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TRIM(
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COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
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) AS p2_cmd,
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COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path) AS p2_path,
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COALESCE(
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p1_p2_hash.path,
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pe1_p2_hash.path,
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pe1_pe2_hash.path
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) AS p2_hash,
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REGEX_MATCH (
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COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
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'.*/(.*)',
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1
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) AS p2_name,
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-- Exception key
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REGEX_MATCH (pe.path, '.*/(.*)', 1) || ',' || MIN(pe.euid, 500) || ',' || REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) || ',' || REGEX_MATCH (
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COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
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'.*/(.*)',
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1
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) AS exception_key
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FROM
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process_events pe,
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uptime
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LEFT JOIN processes p ON pe.pid = p.pid
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-- Parents (via two paths)
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LEFT JOIN processes p1 ON pe.parent = p1.pid
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LEFT JOIN hash p_hash1 ON p1.path = p_hash1.path
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LEFT JOIN process_events pe1 ON pe.parent = pe1.pid
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AND pe1.cmdline != ''
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LEFT JOIN hash pe_hash1 ON pe1.path = pe_hash1.path
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-- Grandparents (via 3 paths)
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LEFT JOIN processes p1_p2 ON p1.parent = p1_p2.pid -- Current grandparent via parent processes
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LEFT JOIN processes pe1_p2 ON pe1.parent = pe1_p2.pid -- Current grandparent via parent events
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LEFT JOIN process_events pe1_pe2 ON pe1.parent = pe1_p2.pid
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AND pe1_pe2.cmdline != '' -- Past grandparent via parent events
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LEFT JOIN hash p1_p2_hash ON p1_p2.path = p1_p2_hash.path
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LEFT JOIN hash pe1_p2_hash ON pe1_p2.path = pe1_p2_hash.path
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LEFT JOIN hash pe1_pe2_hash ON pe1_pe2.path = pe1_pe2_hash.path
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WHERE
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uptime.total_seconds > 30
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-- NOTE: The remainder of this query is synced with unexpected-fetcher-parents
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AND pe.path IN (
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'/usr/bin/systemctl',
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'/bin/systemctl',
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'/sbin/systemctl'
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)
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AND pe.cmdline != ''
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AND pe.time > (strftime('%s', 'now') -300)
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AND NOT exception_key IN (
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'systemctl,0,apt-helper,',
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'systemctl,500,systemd,',
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'systemctl,0,dash,logrotate',
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'systemctl,0,snapd,systemd',
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'systemctl,500,bash,gnome-terminal-server',
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'systemctl,0,pacman,pacman',
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'systemctl,0,pacman,sudo',
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'systemctl,0,tailscaled,',
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'systemctl,0,,containerd-shim-runc-v2'
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)
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AND NOT p0_cmd IN (
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'/bin/systemctl is-enabled -q whoopsie.path',
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'/bin/systemctl -q is-enabled whoopsie.path',
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'systemctl reboot',
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'/bin/systemctl stop --no-block nvidia-persistenced',
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'/sbin/runlevel',
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'systemctl is-active systemd-resolved.service',
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'systemctl is-enabled power-profiles-daemon.service',
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'systemctl is-enabled snapd.apparmor',
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'systemctl is-enabled systemd-rfkill.service',
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'systemctl is-enabled systemd-rfkill.socket',
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'systemctl is-enabled tlp.service',
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'systemctl kill -s HUP rsyslog.service',
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'systemctl -p LoadState show cups.service',
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'systemctl -q is-enabled whoopsie',
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'systemctl --quiet is-enabled cups.service',
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'systemctl restart cups.service',
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'systemctl status kubelet',
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'systemctl stop kubelet',
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'systemctl --user import-environment DISPLAY XAUTHORITY',
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'/usr/bin/systemctl try-reload-or-restart dbus'
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)
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-- apt-helper form
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AND NOT p0_cmd LIKE '%systemctl is-active -q %.service'
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AND NOT p0_cmd LIKE '%systemctl show --property=%'
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AND NOT p0_cmd LIKE '%systemctl % snap-kubectl-%.mount'
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AND NOT p0_cmd LIKE '%systemctl --user set-environment DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/%/bus'
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GROUP BY
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pe.pid
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