mirror of
https://github.com/chainguard-dev/osquery-defense-kit
synced 2024-12-12 17:14:37 +00:00
60 lines
1.8 KiB
SQL
60 lines
1.8 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 pe.path AS path,
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REGEX_MATCH (pe.path, '.*/(.*)', 1) AS name,
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TRIM(pe.cmdline) AS cmd,
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pe.pid AS pid,
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pe.euid AS euid,
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pe.parent AS parent_pid,
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TRIM(IIF(pp.cmdline != NULL, pp.cmdline, ppe.cmdline)) AS parent_cmd,
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TRIM(IIF(pp.path != NULL, pp.path, ppe.path)) AS parent_path,
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REGEX_MATCH (
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IIF(pp.path != NULL, pp.path, ppe.path),
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'.*/(.*)',
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1
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) AS parent_name,
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TRIM(IIF(pp.path != NULL, hash.sha256, ehash.sha256)) AS parent_hash,
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TRIM(IIF(gp.cmdline != NULL, gp.cmdline, gpe.cmdline)) AS gparent_cmd,
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TRIM(IIF(gp.path != NULL, gp.path, gpe.path)) AS gparent_path,
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REGEX_MATCH (
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IIF(gp.path != NULL, gp.path, gpe.path),
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'.*/(.*)',
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1
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) AS gparent_name,
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IIF(pp.parent != NULL, pp.parent, ppe.parent) AS gparent_pid,
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IIF(
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signature.identifier != NULL,
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signature.identifier,
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esignature.identifier
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) AS parent_identifier,
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IIF(
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signature.authority != NULL,
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signature.authority,
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esignature.authority
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) AS parent_authority
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FROM process_events pe
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LEFT JOIN processes p ON pe.pid = p.pid
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LEFT JOIN processes pp ON pe.parent = pp.pid
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LEFT JOIN process_events ppe ON pe.parent = ppe.pid
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LEFT JOIN processes gp ON gp.pid = pp.parent
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LEFT JOIN process_events gpe ON ppe.parent = gpe.pid
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LEFT JOIN hash ON pp.path = hash.path
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LEFT JOIN hash ehash ON ppe.path = ehash.path
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LEFT JOIN signature ON pp.path = signature.path
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LEFT JOIN signature esignature ON ppe.path = esignature.path
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WHERE pe.path = '/usr/bin/xattr'
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AND pe.time > (strftime('%s', 'now') -300)
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AND NOT (
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pe.euid > 500 AND
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cmd LIKE '%xattr -l %'
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)
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GROUP BY pe.pid
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