mirror of
https://github.com/chainguard-dev/osquery-defense-kit
synced 2024-12-12 09:04:35 +00:00
111 lines
2.7 KiB
SQL
111 lines
2.7 KiB
SQL
-- Processes that have an unrelated name in the process tree than the program on disk.
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--
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-- false positives:
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-- * new software, particularly those using interpreted languages
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1036/004/ (Masquerade Task or Service)
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--
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-- tags: persistent process
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SELECT
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SUBSTR(
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COALESCE(
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-- TODO: Fix to not require filename!
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REGEX_MATCH (f.filename, '(.*?)\W', 1),
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f.filename
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),
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0,
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6
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) AS short_filename,
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COALESCE(REGEX_MATCH (p0.path, '.*/(.*)', 1), p0.path) AS basename,
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COALESCE(
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REGEX_MATCH (p0.path, '.*/([a-zA-Z]+)', 1),
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p0.path
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) AS base_letters,
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CONCAT (
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MIN(p0.euid, 500),
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',',
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COALESCE(REGEX_MATCH (p0.path, '.*/(.*)', 1), p0.path),
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',',
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p0.name
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) AS exception_key,
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-- Child
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p0.pid AS p0_pid,
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p0.path AS p0_path,
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p0.name AS p0_name,
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p0.cmdline AS p0_cmd,
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p0.cwd AS p0_cwd,
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p0.cgroup_path AS p0_cgroup,
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p0.euid AS p0_euid,
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p0_hash.sha256 AS p0_sha256,
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-- Parent
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p0.parent AS p1_pid,
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p1.path AS p1_path,
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p1.name AS p1_name,
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p1.euid AS p1_euid,
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p1.cmdline AS p1_cmd,
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p1_hash.sha256 AS p1_sha256,
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-- Grandparent
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p1.parent AS p2_pid,
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p2.name AS p2_name,
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p2.path AS p2_path,
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p2.cmdline AS p2_cmd,
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p2_hash.sha256 AS p2_sha256
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FROM
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processes p0
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LEFT JOIN file f ON p0.path = f.path
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LEFT JOIN hash p0_hash ON p0.path = p0_hash.path
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LEFT JOIN processes p1 ON p0.parent = p1.pid
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LEFT JOIN hash p1_hash ON p1.path = p1_hash.path
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LEFT JOIN processes p2 ON p1.parent = p2.pid
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LEFT JOIN hash p2_hash ON p2.path = p2_hash.path
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WHERE
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p0.path != ''
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AND NOT p0.name == basename
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AND NOT (
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LENGTH(basename) > 1
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AND basename == short_filename
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)
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AND NOT (
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LENGTH(p0.name) > 2
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AND INSTR(LOWER(basename), LOWER(p0.name)) > 0
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)
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AND NOT (
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LENGTH(short_filename) > 2
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AND INSTR(LOWER(p0.name), LOWER(short_filename)) > 0
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) -- Extremely common and unpredictable process name setters
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AND NOT base_letters IN (
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'bash',
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'dash',
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'electron',
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'firefox',
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'node',
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'perl',
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'python',
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'ruby',
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'thunderbird'
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)
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AND NOT exception_key IN (
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'0,udevadm,systemd-udevd',
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'0,udevadm,(udev-worker)',
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'500,netcat,nc',
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'120,systemd,(sd-pam)',
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'500,busybox,sh',
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'125,systemd,(sd-pam)',
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'127,systemd,(sd-pam)',
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'42,systemd,(sd-pam)',
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'500,coreutils,tail',
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'500,gjs-console,gnome-character',
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'500,plugin-container,MainThread',
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'500,pyrogenesis,main',
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'500,rootlesskit,exe',
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'500,rootlessport,exe',
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'500,systemd,(sd-pam)',
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'500,udevadm,systemd-udevd',
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'500,vim.basic,vi'
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)
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AND NOT p0.path IN ('/usr/lib/systemd/systemd')
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AND NOT p0_cgroup LIKE '/system.slice/docker-%'
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GROUP by
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exception_key
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