90 lines
2.0 KiB
SQL
90 lines
2.0 KiB
SQL
-- Find programs which spawn root children without propagating environment variables
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--
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-- references:
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-- * https://www.sandflysecurity.com/blog/bpfdoor-an-evasive-linux-backdoor-technical-analysis/
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--
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-- tags: persistent state daemon process
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-- interval: 600
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-- platform: linux
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SELECT
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COUNT(key) AS count,
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p.pid,
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p.path,
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p.name,
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p.on_disk,
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p.cgroup_path,
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hash.sha256,
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p.parent,
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p.cmdline,
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p.cwd,
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pp.name AS parent_name,
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pp.cmdline AS parent_cmd
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-- Processes is 20X faster to scan than process_envs
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FROM
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processes p
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LEFT JOIN hash ON p.path = hash.path
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LEFT JOIN process_envs pe ON p.pid = pe.pid
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LEFT JOIN processes pp ON p.parent = pp.pid
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WHERE
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p.euid = 0
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-- This time should match the interval
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AND p.start_time > (strftime('%s', 'now') - 601)
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-- Filter out transient processes that may not have an envs entry by the time we poll for it
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AND p.start_time < (strftime('%s', 'now') - 1)
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AND p.parent NOT IN (0, 2)
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AND NOT p.path IS NULL
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AND p.name NOT IN (
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'1Password-Keyri',
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'abrt-handle-eve',
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'applydeltarpm',
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'bwrap',
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'crond',
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'cupsd',
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'dhcpcd',
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'dnf',
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'fprintd',
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'gdm-session-wor',
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'gdm-x-session',
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'gpg-agent',
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'modprobe',
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'nginx',
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'osqueryi',
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'realmd',
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'sedispatch',
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'ssh',
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'sshd',
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'sudo',
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'systemd',
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'systemd-udevd',
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'systemd-userdbd',
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'systemd-userwor',
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'(udev-worker)',
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'Xorg',
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'zfs',
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'zypak-sandbox'
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)
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AND NOT pp.name IN (
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'systemd-userdbd',
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'crond',
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'systemd',
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'systemd-udevd',
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'(udev-worker)'
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)
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AND NOT (
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p.name LIKE 'systemd-%'
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AND p.parent = 1
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)
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AND NOT p.cgroup_path IN ('/system.slice/cronie.service')
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AND NOT pp.cmdline LIKE 'bwrap %'
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AND NOT p.cmdline LIKE '%--type=zygote%'
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AND NOT p.cmdline LIKE '%--disable-seccomp-filter-sandbox%'
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AND NOT p.cgroup_path LIKE '/system.slice/docker-%'
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AND NOT (
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p.name = 'sh'
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AND p.cgroup_path = '/system.slice/znapzend.service'
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)
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GROUP BY
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p.pid
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HAVING
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count == 0;
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