osquery-defense-kit/detection/discovery/unexpected-netutil-calls-macos.sql

121 lines
3.9 KiB
SQL

-- Suspicious parenting of fetch tools (event-based)
--
-- refs:
-- * https://attack.mitre.org/techniques/T1016/ (System Network Configuration Discovery)
--
-- tags: transient process state often
-- platform: darwin
-- interval: 600
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.pid AS p0_pid,
pe.time AS p0_time,
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.path IN (
'/sbin/ifconfig',
'/usr/sbin/netstat',
'/usr/bin/nscurl',
'/sbin/pfctl',
'/usr/libexec/ApplicationFirewall/socketfilterfw'
)
AND uptime.total_seconds > 30
AND pe.time > (strftime('%s', 'now') -600)
AND pe.cmdline != ''
AND pe.cmdline IS NOT NULL
AND pe.status == 0
AND NOT (
pe.euid > 500
AND p1_name IN ('sh', 'fish', 'zsh', 'bash', 'dash')
AND p2_name IN (
'kitty',
'login',
'tmux',
'ShellLauncher',
'sudo',
'tmux:server',
'zsh'
)
)
AND NOT exception_key IN (
'ifconfig,0,pia-daemon,launchd',
'ifconfig,0,pia-openvpn,pia-daemon',
'ifconfig,500,zsh,stable',
'ifconfig,500,dotnet,zsh',
'ifconfig,500,dotnet,dotnet',
'netstat,0,io.tailscale.ipn.macsys.network-extension,launchd',
'netstat,0,metricbeat,elastic-agent',
'netstat,0,pia-daemon,launchd',
'netstat,500,AccountSubscriber,launchd',
'netstat,500,IPNExtension,launchd',
'netstat,500,coresymbolicationd,launchd',
'pfctl,0,bash,pia-daemon',
'pfctl,0,pia-daemon,launchd'
)
AND p1_cmd NOT IN ('/bin/sh /etc/periodic/daily/420.status-network')
AND p1_authority != 'Software Signing'
GROUP BY
pe.pid