134 lines
5.4 KiB
SQL
134 lines
5.4 KiB
SQL
-- Find processes that run with a lower effective UID than their parent (event-based)
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1548/001/ (Setuid and Setgid)
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-- * https://cybersecurity.att.com/blogs/labs-research/shikitega-new-stealthy-malware-targeting-linux
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--
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-- related:
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-- * unexpected-privilege-escalation.sql
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--
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-- tags: events process escalation disabled
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-- platform: darwin
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-- interval: 300
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SELECT -- 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.pid AS p0_pid,
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pe.uid AS p0_uid,
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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(p1.euid, pe1.euid) AS p1_euid,
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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 -- Parents (via two paths)
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LEFT JOIN processes p1 ON pe.parent = p1.pid
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AND p1.start_time <= pe.time
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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.time <= pe.time
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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 -- Grandparents (via 3 paths)
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LEFT JOIN processes p1_p2 ON p1.parent = p1_p2.pid
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AND p1_p2.start_time <= p1.start_time
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LEFT JOIN processes pe1_p2 ON pe1.parent = pe1_p2.pid
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AND pe1_p2.start_time <= pe1.time
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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 p0_euid < p1_euid
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AND pe.status = 0
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AND pe.parent > 0
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AND pe.cmdline != ''
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AND pe.cmdline IS NOT NULL
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AND p1_path NOT IN (
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'/Applications/LogiTune.app/Contents/MacOS/LogiTune',
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'/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/Metadata.framework/Versions/A/Support/mdworker_shared',
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'/System/Library/PrivateFrameworks/AOSKit.framework/Versions/A/XPCServices/com.apple.iCloudHelper.xpc/Contents/MacOS/com.apple.iCloudHelper',
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'/Library/Apple/System/Library/CoreServices/XProtect.app/Contents/XPCServices/XProtectPluginService.xpc/Contents/MacOS/XProtectPluginService',
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'/usr/bin/login',
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'/usr/bin/su',
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'/usr/bin/sudo',
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'/usr/libexec/mdmclient',
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'/usr/libexec/PerfPowerServicesExtended',
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'/usr/local/bin/doas'
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) -- Exclude weird bad data we've seen due to badly recorded macOS parent/child relationships, fixable by reboot
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AND NOT p0_cmd IN (
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'/usr/sbin/cupsd -l',
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'/usr/sbin/cfprefsd agent',
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'/usr/libexec/wifip2pd',
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'/System/Library/CoreServices/iconservicesd',
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'/System/Library/PrivateFrameworks/InstallCoordination.framework/Support/installcoordinationd',
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'/System/Library/PrivateFrameworks/CoreSymbolication.framework/coresymbolicationd',
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'/usr/libexec/PerfPowerServicesExtended',
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'/usr/libexec/mdmclient daemon',
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'/System/Library/Frameworks/CoreServices.framework/Frameworks/Metadata.framework/Versions/A/Support/mdworker_shared -s mdworker -c MDSImporterWorker -m com.apple.mdworker.shared'
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)
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AND NOT exception_key IN (
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'amfid,0,com.docker.backend,Docker',
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'biometrickitd,0,LogiTune,launchd',
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'bioutil,0,callservicesd,launchd',
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'com.apple.geod,0,fmfd,launchd',
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'trustd,205,trustd,launchd',
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'CAReportingService,0,LogiTune,launchd',
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'efilogin-helper,0,containermanagerd,launchd',
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'com.apple.AccountPolicyHelper,0,LogiTune,launchd',
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'com.apple.geod,262,com.docker.backend,Docker',
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'com.apple.WebKit.WebContent,200,zsh,Emacs-arm64-11',
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'containermanagerd,262,com.docker.backend,Docker',
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'dprivacyd,0,com.docker.backend,Docker',
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'SCHelper,0,com.docker.backend,Docker',
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'suhelperd,0,LogiTune,launchd',
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'sysextd,0,LogiTune,launchd',
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'system_profiler,0,callservicesd,launchd'
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)
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AND NOT (
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pe.euid = 262 -- core media helper id
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AND pe.path = '/System/Library/Frameworks/CoreMediaIO.framework/Versions/A/Resources/AppleCamera.plugin/Contents/Resources/AppleCameraAssistant'
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)
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