Unexpected Root Signer Events Macos
osquery
Programs running as root from unusual signers on macOS
Description
ODK (osquery-defense-kit) is unique in that the queries are designed to be used as part of a production detection & response pipeline. The detection queries are formulated to return zero rows during normal expected behavior, so that they may be configured to generate alerts when rows are returned.
Query
-- Programs running as root from unusual signers on macOS
--
-- platform: darwin
-- interval: 900
-- tags: transient seldom events extra
-- Canonical example of including process parents from process_events
SELECT
f.directory AS dir,
REGEX_MATCH (p.path, '(/.*?/.*?)/', 1) AS top_dir,
-- Child
pe.path AS p0_path,
pe.time AS p0_time,
pe.euid AS p0_euid,
s.authority AS p0_sauth,
s.identifier AS p0_sid,
hash.sha256 AS p0_hash,
REGEX_MATCH (pe.path, '.*/(.*)', 1) AS p0_name,
TRIM(pe.cmdline) AS p0_cmd,
-- pe.cwd is NULL on macOS
p.cwd AS p0_cwd,
pe.pid AS p0_pid,
-- Parent
pe.parent AS p1_pid,
TRIM(COALESCE(p1.cmdline, pe1.cmdline)) AS p1_cmd,
COALESCE(p1.start_time, pe1.time) AS p1_start,
COALESCE(p1.path, pe1.path) AS p1_path,
p1.cwd AS p1_cwd,
COALESCE(p_hash1.sha256, pe_hash1.sha256) AS p1_hash,
REGEX_MATCH (COALESCE(p1.path, pe1.path), '.*/(.*)', 1) AS p1_name,
-- Grandparent
COALESCE(p1.parent, pe1.parent) AS p2_pid,
TRIM(
COALESCE(p1_p2.cmdline, pe1_p2.cmdline, pe1_pe2.cmdline)
) AS p2_cmd,
p1_p2.cwd AS p2_cwd,
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
FROM
process_events pe
LEFT JOIN file f ON pe.path = f.path
LEFT JOIN users u ON pe.uid = u.uid
LEFT JOIN signature s ON pe.path = s.path
LEFT JOIN processes p ON pe.pid = p.pid
LEFT JOIN hash ON pe.path = hash.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
-- 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
WHERE
p0_euid = 0
AND pe.time > (strftime('%s', 'now') -900)
-- query optimization: Exclude SIP protected directories
AND top_dir NOT IN (
'/Library/Apple',
'/System/Library',
'/usr/bin',
'/usr/libexec',
'/usr/sbin'
)
AND s.authority NOT IN (
'Developer ID Application: Adobe Inc. (JQ525L2MZD)',
'Developer ID Application: Apple Inc. - XQuartz (NA574AWV7E)',
'Developer ID Application: Bitdefender SRL (GUNFMW623Y)',
'Developer ID Application: Canonical Group Limited (X4QN7LTP59)',
'Developer ID Application: Corsair Memory, Inc. (Y93VXCB8Q5)',
'Developer ID Application: Docker Inc (9BNSXJN65R)',
'Developer ID Application: Dropbox, Inc. (G7HH3F8CAK)',
'Developer ID Application: Ecamm Network, LLC (5EJH68M642)',
'Developer ID Application: Elasticsearch, Inc (2BT3HPN62Z)',
'Developer ID Application: Fortinet, Inc (AH4XFXJ7DK)',
'Developer ID Application: Foxit Corporation (8GN47HTP75)',
'Developer ID Application: Fumihiko Takayama (G43BCU2T37)',
'Developer ID Application: Google LLC (EQHXZ8M8AV)',
'Developer ID Application: Kandji, Inc. (P3FGV63VK7)',
'Developer ID Application: Keybase, Inc. (99229SGT5K)',
'Developer ID Application: Kolide Inc (YZ3EM74M78)',
'Developer ID Application: Kolide, Inc (X98UFR7HA3)',
'Developer ID Application: Logitech Inc. (QED4VVPZWA)',
'Developer ID Application: Mersive Technologies (63B5A5WDNG)',
'Developer ID Application: Microsoft Corporation (UBF8T346G9)',
'Developer ID Application: Objective Development Software GmbH (MLZF7K7B5R)',
'Developer ID Application: Objective-See, LLC (VBG97UB4TA)',
'Developer ID Application: Opal Camera Inc (97Z3HJWCRT)',
'Developer ID Application: OSQUERY A Series of LF Projects, LLC (3522FA9PXF)',
'Developer ID Application: Parallels International GmbH (4C6364ACXT)',
'Developer ID Application: Private Internet Access, Inc. (5357M5NW9W)',
'Developer ID Application: Rapid7 LLC (UL6CGN7MAL)',
'Developer ID Application: Rogue Amoeba Software, Inc. (7266XEXAPM)',
'Developer ID Application: Rogue Amoeba Software, LLC (7266XEXAPM)',
'Developer ID Application: Ryan Hanson (XSYZ3E4B7D)',
'Developer ID Application: Sanford, L.P. (N3S6676K3E)',
'Developer ID Application: Tailscale Inc. (W5364U7YZB)',
'Software Signing'
)
AND NOT (
s.authority = ""
AND pe.path LIKE "/nix/store/%-nix-%/bin/nix"
AND p1.path = "/sbin/launchd"
)
AND NOT (
s.authority = ""
AND (
pe.path LIKE "/nix/store/%-nix-%/bin/nix-%"
OR pe.path LIKE "/private/var/folders/%/T/tmp.%/nix-installer"
)
AND p1_path = "/usr/bin/sudo"
)
AND NOT (
s.authority = ""
AND pe.path LIKE "/opt/%/bin/%"
AND p1_path IN ("/usr/bin/sudo", "/sbin/launchd")
)
-- Surfshark
AND NOT pe.path LIKE '/Library/SystemExtensions/%/com.surfshark.vpnclient.macos.direct.PacketTunnel-WireGuard.systemextension/Contents/MacOS'tags: SStagSS