110 lines
3.3 KiB
SQL
110 lines
3.3 KiB
SQL
-- Things that call chmod to set executable permissions
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--
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-- references:
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-- * https://www.microsoft.com/en-us/security/blog/2022/05/19/rise-in-xorddos-a-deeper-look-at-the-stealthy-ddos-malware-targeting-linux-devices/
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--
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-- false positives:
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-- * loads of them
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--
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-- tags: transient process events
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-- platform: darwin
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-- interval: 300
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SELECT
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IFNULL(
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REGEX_MATCH (TRIM(pe.cmdline), '.* (/.*)', 1),
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CONCAT (
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pe.cwd,
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'/',
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REGEX_MATCH (TRIM(pe.cmdline), '.* (.*)', 1)
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)
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) AS f_path,
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f.mode AS f_mode,
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f.type AS f_type,
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hash.sha256 AS f_hash,
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magic.data AS f_magic,
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-- Child
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pe.path AS p0_path,
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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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-- Parent
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pe.parent AS p1_pid,
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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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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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LEFT JOIN processes p ON pe.pid = p.pid
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-- Wow, you can do that?
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LEFT JOIN file f ON IFNULL(
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REGEX_MATCH (TRIM(pe.cmdline), '.* (/.*)', 1),
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CONCAT (
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pe.cwd,
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'/',
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REGEX_MATCH (TRIM(pe.cmdline), '.* (.*)', 1)
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)
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) = f.path
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LEFT JOIN hash ON f.path = hash.path
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LEFT JOIN magic ON f.path = magic.path
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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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pe.pid IN (
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SELECT DISTINCT
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pid
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FROM
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process_events
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WHERE
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time > (strftime('%s', 'now') -300)
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AND status = 0
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AND parent > 0
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AND (
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cmdline LIKE '%chmod% 7%'
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OR cmdline LIKE '%chmod% +rwx%'
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OR cmdline LIKE '%chmod% +x%'
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OR cmdline LIKE '%chmod% u+x%'
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OR cmdline LIKE '%chmod% a+x%'
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)
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AND cmdline != 'chmod 0777 /Users/Shared/logitune'
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)
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AND pe.time > (strftime('%s', 'now') -300)
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AND pe.syscall = "execve"
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AND f.type != 'directory'
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GROUP BY
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p0_pid
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