109 lines
2.9 KiB
SQL
109 lines
2.9 KiB
SQL
-- Unexpected programs communicating over non-HTTPS protocols (state-based)
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--
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-- This query is a bit awkward and hobbled due to the lack of osquery support
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-- for looking up binary signatures in Linux.
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1071/ (C&C, Application Layer Protocol)
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--
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-- tags: transient state net rapid
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-- platform: linux
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SELECT
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s.remote_address,
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p.name,
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p.path,
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p.cmdline AS child_cmd,
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p.cwd,
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pp.path AS parent_path,
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p.parent AS parent_pid,
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pp.cmdline AS parent_cmd,
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s.state,
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hash.sha256,
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-- This intentionally avoids file.path, as it won't join across mount namespaces
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CONCAT (
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MIN(s.remote_port, 32768),
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',',
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s.protocol,
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',',
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MIN(p.euid, 500),
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',',
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REPLACE(
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REGEX_MATCH (p.path, '(/.*?)/', 1),
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'/nix',
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'/usr'
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),
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'/',
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REGEX_MATCH (p.path, '.*/(.*?)$', 1),
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',',
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MIN(f.uid, 500),
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'u,',
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MIN(f.gid, 500),
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'g,',
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p.name
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) AS exception_key
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FROM
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process_open_sockets s
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LEFT JOIN processes p ON s.pid = p.pid
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LEFT JOIN processes pp ON p.parent = pp.pid
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LEFT JOIN file f ON p.path = f.path
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LEFT JOIN hash ON p.path = hash.path
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WHERE
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protocol > 0
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AND s.remote_port > 0
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-- See unexpected-https-client
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AND NOT (
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s.remote_port = 443
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AND protocol IN (6, 17)
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)
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-- See unexpected-dns-traffic
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AND NOT (
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s.remote_port = 53
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AND protocol IN (6, 17)
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)
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AND s.remote_address NOT IN (
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'127.0.0.1',
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'::ffff:127.0.0.1',
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'::1',
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'::',
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'0.0.0.0'
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)
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AND s.remote_address NOT LIKE 'fe80:%'
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AND s.remote_address NOT LIKE '127.%'
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AND s.remote_address NOT LIKE '192.168.%'
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AND s.remote_address NOT LIKE '172.1%'
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AND s.remote_address NOT LIKE '172.2%'
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AND s.remote_address NOT LIKE '172.30.%'
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AND s.remote_address NOT LIKE '172.31.%'
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AND s.remote_address NOT LIKE '::ffff:172.%'
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AND s.remote_address NOT LIKE '10.%'
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AND s.remote_address NOT LIKE '::ffff:10.%'
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AND s.remote_address NOT LIKE 'fc00:%'
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AND p.path != ''
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AND NOT exception_key IN (
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'123,17,500,/usr/chronyd,0u,0g,chronyd',
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'22000,6,500,/usr/syncthing,0u,0g,syncthing',
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'4070,6,500,/opt/spotify,0u,0g,spotify',
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'5228,6,500,/opt/chrome,0u,0g,chrome',
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'8000,6,500,/opt/chrome,0u,0g,chrome',
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'8000,6,500,/usr/firefox,0u,0g,firefox',
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'80,6,0,/usr/NetworkManager,0u,0g,NetworkManager', -- fedoraproject.org
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'80,6,0,/usr/tailscaled,0u,0g,tailscaled',
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'80,6,0,/usr/.tailscaled-wrapped,0u,0g,.tailscaled-wra',
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'80,6,500,/opt/chrome,0u,0g,chrome',
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'80,6,500,/usr/firefox,0u,0g,firefox',
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'5228,6,500,/usr/chrome,0u,0g,chrome', -- Android Market/GCM
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'8080,6,500,/opt/chrome,0u,0g,chrome',
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'8080,6,500,/usr/firefox,0u,0g,firefox',
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'8443,6,500,/opt/chrome,0u,0g,chrome',
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'8443,6,500,/usr/firefox,0u,0g,firefox'
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)
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AND NOT (
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p.name = 'syncthing'
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AND f.filename = 'syncthing'
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AND s.remote_port > 1024
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AND s.protocol = 6
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AND p.euid > 500
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)
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GROUP BY
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p.cmdline
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