mirror of
https://github.com/chainguard-dev/osquery-defense-kit
synced 2024-12-23 22:32:04 +00:00
122 lines
4.1 KiB
SQL
122 lines
4.1 KiB
SQL
-- Detect unusual calls to xattr, used to remove filesystem attributes
|
|
--
|
|
-- false positives:
|
|
-- * none observed, but they are expected
|
|
--
|
|
-- interval: 300
|
|
-- platform: darwin
|
|
-- tags: process events
|
|
SELECT
|
|
-- Child
|
|
pe.path AS p0_path,
|
|
REGEX_MATCH (pe.path, '.*/(.*)', 1) AS p0_name,
|
|
TRIM(pe.cmdline) AS p0_cmd,
|
|
pe.cwd AS p0_cwd,
|
|
pe.time AS p0_time,
|
|
pe.pid AS p0_pid,
|
|
pe.euid AS p0_euid,
|
|
s.authority AS p0_authority,
|
|
-- Parent
|
|
pe.parent AS p1_pid,
|
|
TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
|
|
COALESCE(p1.path, pe1.path) AS p1_path,
|
|
COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
|
|
REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
|
|
pe_sig1.authority AS p1_authority,
|
|
-- Grandparent
|
|
COALESCE(p1.parent, pe1.parent) AS p2_pid,
|
|
TRIM(
|
|
COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
|
|
) AS p2_cmd,
|
|
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path) AS p2_path,
|
|
COALESCE(
|
|
p1_p2_hash.path,
|
|
pe1_p2_hash.path,
|
|
pe1_pe2_hash.path
|
|
) AS p2_hash,
|
|
REGEX_MATCH (
|
|
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
|
|
'.*/(.*)',
|
|
1
|
|
) AS p2_name,
|
|
COALESCE(
|
|
p1_p2_sig.authority,
|
|
pe1_p2_sig.authority,
|
|
pe1_pe2_sig.authority
|
|
) AS p2_authority,
|
|
-- Exception key
|
|
REGEX_MATCH (pe.path, '.*/(.*)', 1) || ',' || MIN(pe.euid, 500) || ',' || REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) || ',' || REGEX_MATCH (
|
|
COALESCE(p1_p2.path, pe1_p2.path, pe1_pe2.path),
|
|
'.*/(.*)',
|
|
1
|
|
) AS exception_key
|
|
FROM
|
|
process_events pe,
|
|
uptime
|
|
LEFT JOIN processes p ON pe.pid = p.pid
|
|
LEFT JOIN signature s ON pe.path = s.path
|
|
-- Parents (via two paths)
|
|
LEFT JOIN processes p1 ON pe.parent = p1.pid
|
|
LEFT JOIN hash p_hash1 ON p1.path = p_hash1.path
|
|
LEFT JOIN process_events pe1 ON pe.parent = pe1.pid
|
|
AND pe1.cmdline != ''
|
|
LEFT JOIN hash pe_hash1 ON pe1.path = pe_hash1.path
|
|
LEFT JOIN signature pe_sig1 ON pe1.path = pe_sig1.path
|
|
-- Grandparents (via 3 paths)
|
|
LEFT JOIN processes p1_p2 ON p1.parent = p1_p2.pid -- Current grandparent via parent processes
|
|
LEFT JOIN processes pe1_p2 ON pe1.parent = pe1_p2.pid -- Current grandparent via parent events
|
|
LEFT JOIN process_events pe1_pe2 ON pe1.parent = pe1_p2.pid
|
|
AND pe1_pe2.cmdline != '' -- Past grandparent via parent events
|
|
LEFT JOIN hash p1_p2_hash ON p1_p2.path = p1_p2_hash.path
|
|
LEFT JOIN hash pe1_p2_hash ON pe1_p2.path = pe1_p2_hash.path
|
|
LEFT JOIN hash pe1_pe2_hash ON pe1_pe2.path = pe1_pe2_hash.path
|
|
LEFT JOIN signature p1_p2_sig ON p1_p2.path = p1_p2_sig.path
|
|
LEFT JOIN signature pe1_p2_sig ON pe1_p2.path = pe1_p2_sig.path
|
|
LEFT JOIN signature pe1_pe2_sig ON pe1_pe2.path = pe1_pe2_sig.path
|
|
WHERE
|
|
pe.time > (strftime('%s', 'now') -300)
|
|
AND pe.status = 0
|
|
AND pe.cmdline != ''
|
|
AND pe.cmdline IS NOT NULL
|
|
AND pe.status == 0
|
|
AND pe.path = '/usr/bin/xattr'
|
|
AND p0_cmd NOT LIKE '%xattr -d -r com.apple.quarantine /Applications/%.app'
|
|
AND p0_cmd NOT LIKE '%xattr -r -d com.apple.quarantine /Applications/%.app'
|
|
AND p0_cmd NOT LIKE '%xattr -d com.apple.quarantine /Applications/%.app'
|
|
AND p0_cmd NOT LIKE '%xattr -d com.apple.quarantine /Applications/%.app/%.xpc'
|
|
AND p0_cmd NOT LIKE '%xattr -d com.apple.FinderInfo /Applications/Parallels Desktop.app'
|
|
AND NOT (
|
|
pe.euid > 500
|
|
AND p0_cmd LIKE '%xattr -l %'
|
|
)
|
|
AND NOT (
|
|
pe.euid > 500
|
|
AND p0_cmd LIKE '%xattr -p com.apple.quarantine %'
|
|
)
|
|
AND NOT (
|
|
pe.euid > 500
|
|
AND p0_cmd LIKE '%xattr -p com.apple.rootless /Users/%/Library/Containers/%'
|
|
)
|
|
AND NOT (
|
|
pe.euid > 500
|
|
AND p0_cmd LIKE '%xattr -p com.apple.metadata:kMDItemAlternateNames %'
|
|
)
|
|
AND NOT (
|
|
pe.euid > 500
|
|
AND p0_cmd LIKE '/usr/bin/xattr -w com.apple.metadata:kMDItemAlternateNames %'
|
|
)
|
|
AND NOT (
|
|
pe.euid > 500
|
|
AND p0_cmd LIKE 'xattr -r -d com.apple.quarantine /Users/%/.provisio/bin/%.app'
|
|
)
|
|
AND NOT (
|
|
pe.euid > 500
|
|
AND p0_cmd = '/usr/bin/xattr -h'
|
|
AND p1_cmd LIKE '%brew%'
|
|
)
|
|
AND p0_cmd NOT LIKE '/usr/bin/xattr -w com.apple.quarantine 0002;%'
|
|
AND p0_cmd NOT LIKE '/usr/bin/xattr -w com.apple.quarantine 0181;%'
|
|
AND p0_cmd NOT LIKE '/usr/bin/xattr -w com.apple.quarantine 0381;%'
|
|
GROUP BY
|
|
pe.pid
|