82 lines
2.3 KiB
SQL
82 lines
2.3 KiB
SQL
-- Find processes that run with a lower effective UID than their parent (event-based)
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1548/001/ (Setuid and Setgid)
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-- * https://cybersecurity.att.com/blogs/labs-research/shikitega-new-stealthy-malware-targeting-linux
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--
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-- related:
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-- * unexpected-privilege-escalation.sql
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--
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-- tags: events process escalation
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-- platform: linux
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-- interval: 30
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SELECT
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p.pid AS child_pid,
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p.path AS child_path,
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REGEX_MATCH (RTRIM(file.path, '/'), '.*/(.*?)$', 1) AS child_name,
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p.cmdline AS child_cmdline,
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p.time,
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pp.cgroup_path,
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pp.start_time,
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p.euid AS child_euid,
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file.mode AS child_mode,
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hash.sha256 AS child_hash,
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p.parent AS parent_pid,
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pp.path AS parent_path,
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pp.name AS parent_name,
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pp.cmdline AS parent_cmdline,
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pp.euid AS parent_euid,
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pfile.mode AS parent_mode,
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phash.sha256 AS parent_hash
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FROM
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process_events p
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JOIN processes pp ON p.parent = pp.pid
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LEFT JOIN file ON p.path = file.path
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LEFT JOIN hash ON p.path = hash.path
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LEFT JOIN file AS pfile ON pp.path = pfile.path
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LEFT JOIN hash AS phash ON pp.path = phash.path
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WHERE
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p.time > (strftime('%s', 'now') -30)
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AND p.euid < pp.euid
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AND p.path NOT IN (
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'/',
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'/bin/ps',
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'/usr/bin/doas',
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'/usr/bin/fusermount',
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'/usr/bin/fusermount3',
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'/usr/bin/login',
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'/usr/bin/sudo',
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'/usr/bin/gpgsm',
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'/usr/bin/gpgconf',
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'/usr/bin/gpg',
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'/usr/bin/top',
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'/usr/lib/snapd/snap-confine',
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'/usr/lib/snapd/snap-update-ns',
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'/opt/1Password/1Password-KeyringHelper',
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'/usr/lib/systemd/systemd',
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'/usr/lib/Xorg.wrap',
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'/usr/lib/xorg/Xorg.wrap'
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)
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AND p.path NOT LIKE '/nix/store/%/bin/sudo'
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AND p.path NOT LIKE '/nix/store/%/bin/dhcpcd'
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AND p.path NOT LIKE '/snap/snapd/%/usr/lib/snapd/snap-confine'
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AND p.path NOT LIKE '/snap/snapd/%/usr/lib/snapd/snap-update-ns'
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AND NOT pp.cmdline = '/usr/lib/systemd/systemd --user'
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-- used by kind
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AND NOT (
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p.path = '/usr/bin/bash'
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AND p.cmdline = '/bin/bash /usr/local/bin/mount-product-files'
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)
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AND NOT (
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child_name = 'polkit-agent-helper-1'
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AND parent_path = '/usr/bin/gnome-shell'
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)
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AND NOT (
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child_name = 'fusermount3'
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AND parent_path = '/usr/lib/xdg-document-portal'
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)
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AND NOT (
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child_name IN ('dash', 'pkexec')
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AND parent_path = '/usr/bin/update-notifier'
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)
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