222 lines
6.8 KiB
SQL
222 lines
6.8 KiB
SQL
-- Unexpected process that spawns shell processes (event-based)
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--
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-- false positives:
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-- * IDE's
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1059/ (Command and Scripting Interpreter)
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-- * https://attack.mitre.org/techniques/T1204/002/ (User Execution: Malicious File)
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--
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-- tags: process events
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-- interval: 300
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-- platform: posix
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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(COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)) 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(p1_p2_hash.path, pe1_p2_hash.path, pe1_pe2_hash.path) AS p2_hash,
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REGEX_MATCH(COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path), '.*/(.*)', 1) 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(COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path), '.*/(.*)', 1) AS exception_key
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FROM
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process_events pe
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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 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 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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pe.time > (strftime('%s', 'now') -300)
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AND pe.cmdline != ''
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AND pe.parent > 0
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AND p0_name IN ('sh', 'fish', 'zsh', 'bash', 'dash')
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AND NOT (
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p1_name IN (
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'abrt-handle-eve',
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'alacritty',
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'at-spi-bus-launcher',
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'bash',
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'build-script-build',
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'chainctl',
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'chezmoi',
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'clang-11',
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'code',
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'Code Helper (Renderer)',
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'Code - Insiders Helper (Renderer)',
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'collect2',
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'com.docker.backend',
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'conmon',
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'containerd-shim',
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'cpptools',
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'dash',
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'demoit',
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'direnv',
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'doas',
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'docker-credential-desktop',
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'docker-credential-gcr',
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'Docker Desktop',
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'Emacs-arm64-11',
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'env',
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'erl_child_setup',
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'find',
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'FinderSyncExtension',
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'fish',
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'gatherheaderdoc',
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'gdm3',
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'gdm-session-worker',
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'gdm-x-session',
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'git',
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'gke-gcloud-auth-plugin',
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'gnome-session-binary',
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'gnome-shell',
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'gnome-terminal-server',
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'go',
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'goland',
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'gopls',
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'helm',
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'HP Diagnose & Fix',
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'i3bar',
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'i3blocks',
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'java',
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'kitty',
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'ko',
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'kubectl',
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'lightdm',
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'local-path-provisioner',
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'login',
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'make',
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'monorail',
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'my_print_defaults',
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'ninja',
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'nix',
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'nix-build',
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'nix-daemon',
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'nm-dispatcher',
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'node',
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'nvim',
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'package_script_service',
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'perl',
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'PK-Backend',
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'pulumi',
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-- 'python' - do not include this, or you won't detect supply-chain attacks.
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'roxterm',
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'sdk',
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'sdzoomplugin',
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'sh',
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'ShellLauncher',
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'skhd',
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'snyk',
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'sshd',
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'Stream Deck',
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'sudo',
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'swift',
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'systemd',
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'systemd-sleep',
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'terminator',
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'terraform-ls',
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'test2json',
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'tmux',
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'tmux:server',
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'update-notifier',
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'vi',
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'vim',
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'Vim',
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'watch',
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'wezterm-gui',
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'xargs',
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'xcrun',
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'xfce4-terminal',
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'Xorg',
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'yay',
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'yum',
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'zed',
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'zellij',
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'zsh'
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)
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OR p1_name LIKE 'terraform-provider-%'
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-- Do not add shells to this list if you want your query to detect
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-- bad programs that were started from a shell.
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OR p2_name IN ('env', 'git')
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-- Homebrew, except we don't want to allow all of ruby
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OR p0_cmd IN (
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'/bin/bash /usr/bin/xdg-settings set default-url-scheme-handler slack Slack.desktop',
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'/bin/sh -c lsb_release -a --short',
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'/bin/sh -c ps ax -ww -o pid,ppid,uid,gid,args',
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'/bin/sh /usr/bin/lsb_release -a --short',
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'/bin/zsh -c ls',
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'sh -c /bin/stty size 2>/dev/null',
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"sh -c osascript -e 'user locale of (get system info)'",
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'sh -c python3.7 --version 2>&1',
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'sh -c xcode-select --print-path >/dev/null 2>&1 && xcrun --sdk macosx --show-sdk-path 2>/dev/null'
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)
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OR (
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p1_name = 'WhatsApp'
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-- WhatsApp grabs the serial number from people's machines :(
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AND p0_cmd = '/bin/sh -c ioreg -c IOPlatformExpertDevice -d 2'
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)
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OR p1_cmd IN (
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'/usr/bin/python3 /usr/share/apport/apport-gtk',
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'php ./autodocs update images'
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)
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OR (
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p1_cmd LIKE '%Python% /opt/homebrew/bin/jupyter%'
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AND p0_cmd = '/bin/sh -c osascript'
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)
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OR (
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p1_name = 'osqueryd'
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AND p0_cmd LIKE '/bin/sh /etc/NetworkManager/dispatcher.d/%'
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)
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OR (
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p1_name = 'ssh'
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AND p0_cmd LIKE 'gcloud.py compute start-iap-tunnel%'
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)
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OR exception_key IN (
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'bash,0,pia-daemon,launchd',
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'bash,0,udevadm,udevadm',
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'zsh,500,python3.10,gnome-shell'
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)
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OR p0_cmd LIKE '%/bash -e%/bin/as -arch%'
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OR p0_cmd LIKE '/bin/bash /usr/local/Homebrew/%'
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OR p0_cmd LIKE '/bin/bash /opt/homebrew/%'
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OR p0_cmd LIKE '/bin/sh -c pkg-config %'
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OR p0_cmd LIKE '/bin/sh %/docker-credential-gcloud get'
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OR p0_cmd LIKE '%/google-chrome% --flag-switches-begin % --product-version'
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OR p0_cmd LIKE '/bin/sh /usr/bin/xdg-open %'
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OR p0_cmd LIKE '/bin/bash /usr/bin/xdg-settings check %'
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OR p0_cmd LIKE '/bin/sh /usr/bin/xdg-settings set %'
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OR p0_cmd LIKE '/bin/sh /usr/bin/xdg-settings check %'
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OR p0_cmd LIKE '%gcloud config config-helper --format=json'
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OR p0_cmd LIKE '%gcloud config get-value%'
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OR p1_cmd LIKE '%Python /opt/homebrew/bin/aws configure sso'
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OR p2_cmd LIKE '/bin/bash /usr/local/bin/brew%'
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OR p2_cmd LIKE '/usr/bin/python3 -m py_compile %'
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)
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GROUP BY
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pe.pid
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