154 lines
4.3 KiB
SQL
154 lines
4.3 KiB
SQL
-- Catch DNS traffic going to machines other than the host-configured DNS server (event-based)
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--
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-- references:
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-- * https://attack.mitre.org/techniques/T1071/004/ (C2: Application Layer Protocol: DNS)
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--
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-- interval: 300
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-- tags: persistent events net
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--
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-- NOTE: The interval above must match WHERE clause to avoid missing events
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--
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-- This only supports IPv4 traffic due to an osquery bug with 'dns_resolvers'
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-- The non-event version is unexpected-dns-traffic.sql
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SELECT
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protocol,
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s.remote_port,
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s.remote_address,
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s.local_port,
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s.local_address,
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s.action,
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s.status,
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p.name,
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COALESCE(REGEX_MATCH (p.path, '.*/(.*)', 1), p.path) AS basename,
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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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s.pid,
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p.parent AS parent_pid,
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pp.cmdline AS parent_cmd,
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hash.sha256,
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CONCAT (p.name, ',', remote_address, ',', remote_port) AS exception_key
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FROM
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socket_events 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 hash ON p.path = hash.path
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WHERE
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s.time > (strftime('%s', 'now') -300)
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AND remote_port IN (53, 5353)
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AND remote_address NOT LIKE '%:%'
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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 '10.%'
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AND s.remote_address NOT LIKE '192.168.%'
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AND s.remote_address NOT LIKE '127.%'
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AND remote_address NOT IN (
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SELECT DISTINCT
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address
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FROM
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dns_resolvers
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WHERE
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type = 'nameserver'
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and address != ''
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)
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-- systemd-resolve sometimes shows up this way
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-- If we could narrow this down using 'sys_resolvers' I would, but it is misuse of GROUP_CONCAT
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AND NOT (
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s.pid = -1
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AND s.remote_port = 53
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and p.parent = ''
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)
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-- Some applications hard-code a safe DNS resolver, or allow the user to configure one
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AND s.remote_address NOT IN (
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'1.1.1.1', -- Cloudflare
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'100.100.100.100', -- Tailscale Magic DNS
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'208.67.220.123', -- OpenDNS FamilyShield
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'75.75.75.75', -- Comcast
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'75.75.76.76', -- Comcast
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'68.105.28.13', -- Cox
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'80.248.7.1', -- 21st Century (NG)
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'34.160.111.32', -- wolfi.dev
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'185.125.190.31', -- Canonical
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'185.125.190.77' -- Canonical
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)
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-- Exceptions that specifically talk to one server
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AND exception_key NOT IN (
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'adguard_dns,1.0.0.1,53',
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'AssetCacheLocatorService,0.0.0.0,53',
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'brave,8.8.8.8,53',
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'CapCut,8.8.8.8,53',
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'cg,108.177.98.95,53',
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'ChatGPT,8.8.8.8,53',
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'com.docker.backend,8.8.8.8,53',
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'com.docker.vpnkit,8.8.8.8,53',
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'Creative Cloud Content Manager.node,8.8.4.4,53',
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'coredns,0.0.0.0,53',
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'coredns,8.8.8.8,53',
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'distnoted,8.8.8.8,53',
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'dockerd,162.159.140.238,53',
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'EpicWebHelper,8.8.4.4,53',
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'EpicWebHelper,8.8.8.8,53',
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'gvproxy,170.247.170.2,53',
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'helm,185.199.108.133,53',
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'limactl,8.8.8.8,53',
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'Meeting Center,8.8.8.8,53',
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'msedge,8.8.8.8,53',
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'nuclei,1.0.0.1,53',
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'plugin-container,8.8.8.8,53',
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'Pieces OS,208.67.222.222,53',
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'ServiceExtension,8.8.8.8,53',
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'Signal Helper (Renderer),8.8.8.8,53',
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'signal-desktop,8.8.8.8,53',
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'slack,8.8.8.8,53',
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'Socket Process,8.8.8.8,53',
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'syncthing,46.162.192.181,53',
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'Telegram,8.8.8.8,53',
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'WebexHelper,8.8.8.8,53',
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'WhatsApp,1.1.1.1,53',
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'ZaloCall,8.8.8.8,53',
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'zed,8.8.8.8,53',
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'ZoomPhone,200.48.225.130,53',
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'ZoomPhone,200.48.225.146,53',
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'ZoomPhone,8.8.8.8,53'
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)
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-- Local DNS servers and custom clients go here
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AND basename NOT IN (
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'adguard_dns',
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'apk',
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'agentbeat',
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'apko',
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'canonical-livep',
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'chrome',
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'com.apple.WebKit.Networking',
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'com.docker.backend',
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'go',
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'wolfictl',
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'gvproxy',
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'grype',
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'incusd',
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'helm',
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'terraform-provi',
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'IPNExtension',
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'Jabra Direct Helper',
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'limactl',
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'mDNSResponder',
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'melange',
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'syncthing',
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'nessusd',
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'nuclei',
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'systemd-resolved',
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'WhatsApp'
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)
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AND p.name NOT IN ('Jabra Direct Helper', 'terraform-provi')
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-- Chromium/Electron apps seem to send stray packets out like nobodies business
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AND p.path NOT LIKE '%/%.app/Contents/MacOS/% Helper'
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AND p.path NOT LIKE '/snap/%'
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-- Workaround for the GROUP_CONCAT subselect adding a blank ent
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GROUP BY
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s.remote_address,
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s.remote_port
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HAVING
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remote_address != ''
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