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-- Catch applications running from unusual directories, such as /tmp
--
-- references:
-- * https://attack.mitre.org/techniques/T1074/
--
-- false positives:
-- * software installers and updaters
-- * developers running programs out of /tmp
--
-- interval: 60
-- platform: darwin
-- tags: filesystem events
SELECT
p.pid,
p.path,
REGEX_MATCH (p.path, '(.*)/', 1) AS dir,
REGEX_MATCH (p.path, '(/.*?/.*?/.*?)/', 1) AS top_dir, -- 3 levels deep
REPLACE(file.directory, u.directory, '~') AS homedir,
REGEX_MATCH (
REPLACE(f.directory, u.directory, '~'),
'(~/.*?/.*?/.*?/)',
1
) AS top3_homedir,
REGEX_MATCH (
REPLACE(file.directory, u.directory, '~'),
'(~/.*?/)',
1
) AS top_homedir, -- 1 level deep
p.cmdline,
p.mode,
p.cwd,
p.euid,
p.parent,
pp.path AS parent_path,
pp.name AS parent_name,
pp.cmdline AS parent_cmd,
pp.euid AS parent_euid,
hash.sha256 AS child_sha256,
phash.sha256 AS parent_sha256,
signature.identifier,
signature.authority
FROM
process_events p
LEFT JOIN processes ON p.pid = processes.pid
LEFT JOIN file ON p.path = file.path
LEFT JOIN users u ON p.uid = u.uid
LEFT JOIN processes pp ON p.parent = pp.pid
LEFT JOIN hash ON p.path = hash.path
LEFT JOIN hash phash ON pp.path = phash.path
LEFT JOIN signature ON p.path = signature.path
WHERE
p.time > (strftime('%s', 'now') -60)
-- The process_events table on macOS ends up with relative directories for some reason?
AND dir LIKE '/%'
AND file.size > 0
AND dir NOT IN (
'/bin',
'/Library/Application Support/Logitech.localized/Logitech Options.localized/LogiMgrUpdater.app/Contents/Resources',
'/Library/DropboxHelperTools/Dropbox_u501',
'/Library/Filesystems/kbfuse.fs/Contents/Resources',
'/Library/Frameworks/Python.framework/Versions/3.10/bin',
'/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Helpers.app/Contents/MacOS',
'/Library/Google/GoogleSoftwareUpdate/GoogleSoftwareUpdate.bundle/Contents/Helpers/GoogleSoftwareUpdateAgent.app/Contents/MacOS',
'/Library/Printers/DYMO/Utilities',
'/Library/PrivilegedHelperTools',
'/Library/TeX/texbin',
'/nix/store',
'/nix/var/nix/profiles/default/bin',
'/node_modules/.bin',
'/opt/homebrew/Caskroom/google-cloud-sdk/latest/google-cloud-sdk/bin/gke-gcloud-auth-plugin',
'/opt/usr/bin',
'/opt/X11/bin',
'/opt/X11/libexec',
'/run/current-system/sw/bin',
'/sbin',
'/usr/bin',
'/usr/lib',
'/usr/lib/bluetooth',
'/usr/lib/cups/notifier',
'/usr/libexec',
'/usr/libexec/ApplicationFirewall',
'/usr/libexec/AssetCache',
'/usr/libexec/firmwarecheckers',
'/usr/libexec/firmwarecheckers/eficheck',
'/usr/libexec/rosetta',
'/usr/lib/fwupd',
'/usr/lib/ibus',
'/usr/lib/system',
'/usr/local/bin',
'/usr/sbin'
)
AND top_dir NOT IN (
'/Applications/Firefox.app/Contents',
'/Applications/Google Chrome.app/Contents',
'/Library/Apple/System',
'/Library/Application Support/Adobe',
'/Library/Application Support/GPGTools',
'/Library/Google/GoogleSoftwareUpdate',
'/System/Applications/Mail.app',
'/System/Applications/Music.app',
'/System/Applications/News.app',
'/System/Applications/TV.app',
'/System/Applications/Weather.app',
'/System/Library/CoreServices',
'/System/Library/Filesystems',
'/System/Library/Frameworks',
'/System/Library/PrivateFrameworks',
'/System/Library/SystemConfiguration',
'/System/Library/SystemProfiler',
'/System/Volumes/Preboot',
'/usr/local/kolide-k2'
)
AND homedir NOT IN (
'~/bin',
'~/code/bin',
'~/Downloads/google-cloud-sdk/bin',
'~/Library/Application Support/dev.warp.Warp-Stable',
'~/go/bin',
'~/Library/Application Support/cloud-code/installer/google-cloud-sdk/bin',
'~/.local/bin',
'~/.magefile',
'~/Downloads/protoc/bin',
'~/projects/go/bin'
)
AND top3_homedir NOT IN (
'~/Library/Application Support/com.elgato.StreamDeck/',
'~/Library/Caches/snyk/',
'~/Library/Application Support/BraveSoftware/'
)
AND top_homedir NOT IN (
'~/Applications/',
'~/Applications (Parallels)/',
'~/bin/',
'~/.cargo/',
'~/chainguard/',
'~/code/',
'~/Code/',
'~/.config/',
'~/git/',
'~/github/',
'~/go/',
'~/google-cloud-sdk/',
'~/homebrew/',
'~/.kuberlr/',
-- '~/Library/',
'~/.gradle/',
'~/.local/',
'~/Parallels/',
'~/proj/',
'~/projects/',
'~/Projects/',
'~/.pulumi/',
'~/.provisio/',
'~/.pyenv/',
'~/.rustup/',
'~/src/',
'~/.tflint.d/',
'~/.vscode/',
'~/.vs-kubernetes/'
)
-- Locally built executables
AND NOT (
signature.identifier = 'a.out'
AND homedir LIKE '~/%'
AND pp.name IN ('fish', 'sh', 'bash', 'zsh', 'terraform', 'code')
)
AND NOT (
signature.authority = ''
AND homedir LIKE '~/%'
AND pp.name IN ('fish', 'sh', 'bash', 'zsh')
AND p.cmdline LIKE './%'
)
AND dir NOT LIKE '../%' -- data issue
AND dir NOT LIKE '/Applications/%'
AND dir NOT LIKE '/private/tmp/%.app/Contents/MacOS'
AND dir NOT LIKE '/private/tmp/go-build%/exe'
AND dir NOT LIKE '/private/tmp/KSInstallAction.%/Install Google Software Update.app/Contents/Helpers'
AND dir NOT LIKE '/private/tmp/nix-build-%'
AND dir NOT LIKE '/private/tmp/PKInstallSandbox.%/Scripts/com.microsoft.OneDrive.%'
AND dir NOT LIKE '/private/var/db/com.apple.xpc.roleaccountd.staging/%.xpc/Contents/MacOS'
AND dir NOT LIKE '/private/var/folders/%/bin'
AND dir NOT LIKE '/private/var/folders/%/Contents/%'
AND dir NOT LIKE '/private/var/folders/%/d/Wrapper/%.app'
AND dir NOT LIKE '/private/var/folders/%/go-build%'
AND dir NOT LIKE '/private/var/folders/%/GoLand'
AND dir NOT LIKE '%/.terraform/providers/%'
AND dir NOT LIKE '/Volumes/com.getdropbox.dropbox-%'
AND homedir NOT LIKE '~/%/google-cloud-sdk/bin/%'
AND homedir NOT LIKE '~/Library/Caches/ms-playwright/%'
AND homedir NOT LIKE '~/%/node_modules/.pnpm/%'
AND homedir NOT LIKE '~/%repo%'
AND homedir NOT LIKE '~/.local/%/packages/%'
AND homedir NOT LIKE '~/%sigstore%'
AND homedir NOT LIKE '~/%/bin'
AND homedir NOT LIKE '~/Library/Printers/%/Contents/MacOS'
-- These signers can run from wherever the hell they want.
AND signature.authority NOT IN (
'Apple iPhone OS Application Signing',
'Apple Mac OS Application Signing',
'Developer ID Application: Adobe Inc. (JQ525L2MZD)',
'Developer ID Application: Cisco (DE8Y96K9QP)',
'Developer ID Application: CodeWeavers Inc. (9C6B7X7Z8E)',
'Developer ID Application: Sublime HQ Pty Ltd (Z6D26JE4Y4)',
'Developer ID Application: Corsair Memory, Inc. (Y93VXCB8Q5)',
'Developer ID Application: Docker Inc (9BNSXJN65R)',
'Developer ID Application: Dropbox, Inc. (G7HH3F8CAK)',
'Developer ID Application: Figma, Inc. (T8RA8NE3B7)',
'Developer ID Application: GEORGE NACHMAN (H7V7XYVQ7D)',
'Developer ID Application: Google LLC (EQHXZ8M8AV)',
'Developer ID Application: Hashicorp, Inc. (D38WU7D763)',
'Developer ID Application: Logitech Inc. (QED4VVPZWA)',
'Developer ID Application: Microsoft Corporation (UBF8T346G9)',
'Developer ID Application: Ned Deily (DJ3H93M7VJ)', -- Python
'Developer ID Application: Node.js Foundation (HX7739G8FX)',
'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: Oracle America, Inc. (VB5E2TV963)',
'Developer ID Application: TablePlus Inc (3X57WP8E8V)',
'Developer ID Application: Tenable, Inc. (4B8J598M7U)',
'Developer ID Application: Valve Corporation (MXGJJ98X76)',
'Developer ID Application: Wireshark Foundation, Inc. (7Z6EMTD2C6)',
'Software Signing'
)
-- Don't spam alerts with repeated invocations of the same command-line
GROUP BY
p.cmdline,
p.cwd,
p.euid;
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