mirror of
https://github.com/chainguard-dev/osquery-defense-kit
synced 2024-12-24 23:02:05 +00:00
122 lines
4.1 KiB
SQL
122 lines
4.1 KiB
SQL
-- Detect unusual calls to xattr, used to remove filesystem attributes
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--
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-- false positives:
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-- * none observed, but they are expected
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--
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-- interval: 300
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-- platform: darwin
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-- tags: process events
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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.time AS p0_time,
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pe.pid AS p0_pid,
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pe.euid AS p0_euid,
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s.authority AS p0_authority,
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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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pe_sig1.authority AS p1_authority,
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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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COALESCE(
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p1_p2_sig.authority,
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pe1_p2_sig.authority,
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pe1_pe2_sig.authority
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) AS p2_authority,
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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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uptime
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LEFT JOIN processes p ON pe.pid = p.pid
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LEFT JOIN signature s ON pe.path = s.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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LEFT JOIN signature pe_sig1 ON pe1.path = pe_sig1.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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LEFT JOIN signature p1_p2_sig ON p1_p2.path = p1_p2_sig.path
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LEFT JOIN signature pe1_p2_sig ON pe1_p2.path = pe1_p2_sig.path
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LEFT JOIN signature pe1_pe2_sig ON pe1_pe2.path = pe1_pe2_sig.path
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WHERE
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pe.time > (strftime('%s', 'now') -300)
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AND pe.status = 0
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AND pe.cmdline != ''
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AND pe.cmdline IS NOT NULL
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AND pe.status == 0
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AND pe.path = '/usr/bin/xattr'
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AND p0_cmd NOT LIKE '%xattr -d -r com.apple.quarantine /Applications/%.app'
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AND p0_cmd NOT LIKE '%xattr -r -d com.apple.quarantine /Applications/%.app'
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AND p0_cmd NOT LIKE '%xattr -d com.apple.quarantine /Applications/%.app'
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AND p0_cmd NOT LIKE '%xattr -d com.apple.quarantine /Applications/%.app/%.xpc'
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AND p0_cmd NOT LIKE '%xattr -d com.apple.FinderInfo /Applications/Parallels Desktop.app'
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AND NOT (
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pe.euid > 500
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AND p0_cmd LIKE '%xattr -l %'
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)
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AND NOT (
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pe.euid > 500
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AND p0_cmd LIKE '%xattr -p com.apple.quarantine %'
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)
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AND NOT (
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pe.euid > 500
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AND p0_cmd LIKE '%xattr -p com.apple.rootless /Users/%/Library/Containers/%'
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)
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AND NOT (
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pe.euid > 500
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AND p0_cmd LIKE '%xattr -p com.apple.metadata:kMDItemAlternateNames %'
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)
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AND NOT (
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pe.euid > 500
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AND p0_cmd LIKE '/usr/bin/xattr -w com.apple.metadata:kMDItemAlternateNames %'
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)
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AND NOT (
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pe.euid > 500
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AND p0_cmd LIKE 'xattr -r -d com.apple.quarantine /Users/%/.provisio/bin/%.app'
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)
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AND NOT (
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pe.euid > 500
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AND p0_cmd = '/usr/bin/xattr -h'
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AND p1_cmd LIKE '%homebrew%'
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)
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AND p0_cmd NOT LIKE '/usr/bin/xattr -w com.apple.quarantine 0002;%'
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AND p0_cmd NOT LIKE '/usr/bin/xattr -w com.apple.quarantine 0181;%'
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AND p0_cmd NOT LIKE '/usr/bin/xattr -w com.apple.quarantine 0381;%'
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GROUP BY
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pe.pid
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